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Robbins' problem

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The Joint Summer Research Conferences in the Mathematical Sciences were held at the University of Massachusetts from June 7 to July 4, 1990. These were sponsored by the AMS, SIAM, and the Institute for Mathematical Statistics (IMS). Topics in 1990 were: Probability models and statistical analysis for
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The general solution to this full-information expected rank problem is unknown. The major difficulty is that the problem is fully history-dependent, that is, the optimal rule depends at every stage on all preceding values, and not only on simpler sufficient statistics of these. Only bounds are known
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would be solved. But the major reason is to understand how to cope with full history dependence in a (deceptively easy-looking) problem. On the Ester's Book International Conference in Israel (2006) Robbins' problem was accordingly named one of the four most important problems in the field of
1180: 100: < 2.329. It is known that there is some room to improve the lower bound by further computations for a truncated version of the problem. It is still not known how to improve on the upper bound which stems from the subclass of memoryless threshold rules. 1553: 978: 2845:
ranking data, Inverse scattering on the line, Deformation theory of algebras and quantization with applications to physics, Strategies for sequential search and selection in real time, Schottky problems, and Logic, fields, and subanalytic sets.
1019: 854: 83:'s sequentially and must stop on exactly one of them. No recall of preceding observations is permitted. What stopping rule minimizes the expected rank of the selected observation, and what is its corresponding value? 739: 772:
has finite second moment, then after subtracting the mean and dividing by the standard deviation, we get a distribution with mean zero and variance one. Consequently it suffices to study the case of
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is the relative rank of the ith observation and n is the total number of items. This rule has added flexibility. A curtailed version thereof can be used to select an item with a given probability
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It was proposed the continuous time version of the problem where the observations follow a Poisson arrival process of homogeneous rate 1. Under some assumptions, the corresponding value function
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A simple suboptimal rule, which performs almost as well as the optimal rule, was proposed by Krieger & Samuel-Cahn. The rule stops with the smallest
798: 1175:{\displaystyle \beta _{n}=\alpha {\sqrt {n}}-1/2+{\frac {(-2\zeta (-1/2)){\sqrt {\alpha }}}{\sqrt {\pi }}}n^{-1/4}+O\left(n^{-7/24}\right)} 672: 593:
is the stopping time? The probability of eventually stopping must be 1 (that is, you are not allowed to keep sampling and never stop).
1924:. Athens Conference on Applied Probability and Time Series Analysis. Vol. 114. New York, NY: Springer New York. pp. 1–17. 1323:
tosses, with k heads and (n-k) tails, should one continue or should one stop? Since 1D random walk is recurrent, starting at any
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is bounded and Lipschitz continuous, and the differential equation for this value function is derived. The limiting value of
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Elton, John H. (2023-06-06). "Exact Solution to the Chow-Robbins Game for almost all n, using the Catalan Triangle".
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When the game is a fair coin toss game, with heads being +1 and tails being -1, then there is a sharper result
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This article is about Robbins' problem of optimal stopping. For the Robbins problem on Boolean algebras, see
2421: 184: 2062:"The secretary problem of minimizing the expected rank: a simple suboptimal approach with generalization" 397: 248: 1251: 445: 1774: 1431: 987: 1713:
One of the motivations to study Robbins' problem is that with its solution all classical (four)
1224: 374:. The rule can be used to select two or more items. The problem of selecting a fixed percentage 2373: 1742: 1364: 1396: 617:
with finite second moment, there exists an optimal strategy, defined by a sequence of numbers
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Dvoretzky, Aryeh. "Existence and properties of certain optimal stopping rules."
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Another optimal stopping problem bearing Robbins' name is the Chow–Robbins game:
981: 43: 2341: 2300: 2283: 2242:"Optimally stopping the sample mean of a Wiener process with an unknown drift" 1920:(1996). "Half-Prophets and Robbins' Problem of Minimizing the expected rank". 1496:, and it found an almost always optimal decision rule, of stopping as soon as 2855: 2476: 2399: 2350: 2309: 2265: 2226: 2134: 2125: 2108: 2080: 2061: 2033: 2014: 1988: 1894: 1835: 1816: 1010:, the discrete time problem becomes the same as the continuous time problem. 980:
which can be proved by solving the same problem with continuous time, with a
849:{\displaystyle \lim _{n}\beta _{n}/{\sqrt {n}}\approx \alpha =0.8399236757} 1361:, the probability of eventually having more heads than tails is 1. So, if 2468: 2089: 2042: 1844: 1221:
is small, the asymptotic bound does not apply, and finding the value of
2358: 2324: 2218: 1996: 1902: 1885: 1866: 1797: 1778: 2203:"Existence of optimal stopping rules for linear and quadratic rewards" 514:, how to decide when to stop, in order to maximize the sample average 161:
presents the solution of Robbins’ problem. It is shown that for large
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Zeitschrift für Wahrscheinlichkeitstheorie und Verwandte Gebiete
2374:"Regarding stopping rules for Brownian motion and random walks" 1303:
For the fair coin toss, a strategy is a binary decision: after
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International Conference on Search and Selection in Real Time
222:. This estimation coincides with the bounds mentioned above. 1768: 2284:"Explicit Solutions to Some Problems of Optimal Stopping" 1425:, it is tricky to decide whether to stop or continue. 1248:
is much more difficult. Even the simplest case, where
2422:"Rigorous Computer Analysis of the Chow–Robbins Game" 1747:
I should like to see this problem solved before I die
1556: 1502: 1463: 1434: 1399: 1367: 1329: 1309: 1254: 1227: 1188: 1022: 990: 882: 862: 801: 778: 758: 675: 623: 603: 579: 520: 500: 448: 400: 380: 354: 334: 307: 251: 231: 187: 167: 138: 109: 2049: 1867:"Minimizing the expected rank with full information" 744: 2450: 2055: 1698: 1542: 1488: 1446: 1417: 1385: 1353: 1315: 1292: 1240: 1194: 1174: 1002: 972: 868: 848: 784: 764: 733: 661: 609: 585: 566:{\displaystyle {\frac {1}{n}}(X_{1}+\cdots X_{n})} 565: 506: 486: 418: 386: 366: 340: 320: 293: 237: 214: 173: 153: 124: 2412: 2853: 2451:Christensen, Sören; Fischer, Simon (June 2022). 2200: 1954: 1909: 1851: 1745:, 1990. He concluded his address with the words 803: 1948: 1209: 2189:Proc. Fifth Berkeley Symp. Math. Statist. Prob 96:goes to infinity, namely 1.908 <  2378:Bulletin of the American Mathematical Society 1915: 1857: 1737:presented the above described problem at the 2240:Simons, Gordon; Yao, Yi-Ching (1989-08-01). 2246:Stochastic Processes and Their Applications 2148: 2146: 2144: 2109:"On optimal stopping rules for $ S_{n}/n$ " 2102: 1300:are fair coin tosses, is not fully solved. 2003: 1779:"Optimal Selection Based on Relative Rank" 1393:, one should always continue. However, if 2389: 2340: 2299: 2239: 2233: 2201:Teicher, H.; Wolfowitz, J. (1966-12-01). 2181: 2158: 2124: 2079: 2032: 2009: 1978: 1929: 1884: 1834: 1805: 1796: 1610: 1609: 1605: 1604: 1589: 1588: 669:. The strategy is to keep sampling until 662:{\displaystyle \beta _{1},\beta _{2},...} 38:, is sometimes referred to as the fourth 2141: 1543:{\displaystyle k-(n-k)\geq \Delta k_{n}} 66:be independent, identically distributed 2015:"What is known about Robbins' Problem?" 1817:"What is known about Robbins' Problem?" 1489:{\displaystyle n\leq 9.06\times 10^{7}} 2854: 2371: 2325:"Optimal Stopping in a Markov Process" 2322: 1762: 215:{\displaystyle 1\leq w(t)\leq 2.33183} 2829:"Solution did not converge" 2329:The Annals of Mathematical Statistics 2288:The Annals of Mathematical Statistics 2278: 2152: 2096: 1811: 2438:10.4169/amer.math.monthly.120.10.893 1457:Elton found exact solutions for all 429: 13: 1557: 1527: 1013:This was proved independently by. 997: 925: 14: 2873: 2426:The American Mathematical Monthly 1922:Lecture Notes in Statistics (LNS) 792:with mean zero and variance one. 419:{\displaystyle 0<\alpha <1} 294:{\displaystyle R_{i}<ic/(n+i)} 42:or the problem of minimizing the 1753:. Robbins himself died in 2001. 1428:found an exact solution for all 745:Optimal strategy for very large 2838: 2493: 2444: 2406: 2391:10.1090/S0002-9904-1969-12140-3 2365: 2316: 2272: 2194: 2113:Illinois Journal of Mathematics 2067:Advances in Applied Probability 1966:Advances in Applied Probability 1293:{\displaystyle X_{1},X_{2},...} 876:is the solution to the equation 487:{\displaystyle X_{1},X_{2},...} 2457:Journal of Applied Probability 2020:Journal of Applied Probability 1872:Journal of Applied Probability 1822:Journal of Applied Probability 1645: 1628: 1521: 1509: 1348: 1336: 1098: 1095: 1078: 1066: 994: 715: 686: 560: 531: 438:Given an infinite sequence of 301:for a given constant c, where 288: 276: 203: 197: 148: 142: 119: 113: 1: 2173:: CS1 maint: date and year ( 1784:Israel Journal of Mathematics 1756: 1708: 2486: 2258:10.1016/0304-4149(89)90084-7 1447:{\displaystyle n\leq 489241} 1003:{\displaystyle n\to \infty } 46:rank with full information. 7: 1931:10.1007/978-1-4612-0749-8_1 1210:Optimal strategy for small 10: 2878: 2323:Taylor, Howard M. (1968). 1769:Chow, Y.S.; Moriguti, S.; 1729: 1241:{\displaystyle \beta _{n}} 15: 2372:Walker, Leroy H. (1969). 1386:{\displaystyle k\leq n-k} 426:, of n, is also treated. 2499: 2013:; Swan, Yvik C. (2009). 1418:{\displaystyle k>n-k} 2862:Stochastic optimization 2342:10.1214/aoms/1177698259 2301:10.1214/aoms/1177697604 1354:{\displaystyle k,(n-k)} 869:{\displaystyle \alpha } 387:{\displaystyle \alpha } 88:for the limiting value 2126:10.1215/ijm/1256068146 2081:10.1239/aap/1261669585 2034:10.1239/jap/1238592113 1836:10.1239/jap/1110381374 1771:Robbins, Herbert Ellis 1700: 1544: 1490: 1448: 1419: 1387: 1355: 1317: 1294: 1242: 1196: 1195:{\displaystyle \zeta } 1176: 1004: 974: 870: 850: 786: 766: 735: 663: 611: 595: 587: 567: 508: 488: 420: 388: 368: 367:{\displaystyle P<1} 342: 322: 295: 239: 216: 175: 155: 126: 85: 2453:"On the Sn/n problem" 1701: 1545: 1491: 1449: 1420: 1388: 1356: 1318: 1295: 1243: 1204:Riemann zeta function 1197: 1177: 1005: 975: 871: 851: 787: 767: 736: 664: 612: 597:For any distribution 588: 568: 509: 489: 436: 421: 389: 369: 343: 323: 321:{\displaystyle R_{i}} 296: 240: 217: 176: 156: 127: 48: 2748:# Print the solution 1554: 1500: 1461: 1432: 1397: 1365: 1327: 1307: 1252: 1225: 1186: 1020: 988: 880: 860: 799: 776: 756: 673: 621: 601: 577: 518: 498: 446: 398: 378: 352: 332: 305: 249: 229: 185: 165: 154:{\displaystyle w(t)} 136: 125:{\displaystyle w(t)} 107: 74:on . We observe the 29:Robbins' problem of 2793:with a residual of 2469:10.1017/jpr.2021.73 1918:Ferguson, S. Thomas 1863:Ferguson, S. Thomas 1775:Samuels, Stephen M. 1724:sequential analysis 929: 2219:10.1007/BF00535366 2107:(September 1965). 2058:Samuel-Cahn, Ester 2056:Krieger, Abba M.; 1957:Samuel-Cahn, Ester 1886:10.1007/bf02759948 1798:10.1007/bf02759948 1715:secretary problems 1696: 1540: 1486: 1444: 1415: 1383: 1351: 1313: 1290: 1238: 1192: 1172: 1000: 984:. At the limit of 970: 915: 866: 846: 811: 782: 762: 731: 659: 607: 583: 563: 504: 494:with distribution 484: 416: 384: 364: 338: 318: 291: 235: 212: 171: 151: 122: 25:probability theory 2775:"Solved α = 1941:978-0-387-94788-4 1916:Bruss, F.Thomas; 1666: 1665: 1658: 1586: 1316:{\displaystyle n} 1114: 1113: 1106: 1044: 832: 802: 785:{\displaystyle F} 765:{\displaystyle F} 684: 610:{\displaystyle F} 586:{\displaystyle n} 529: 507:{\displaystyle F} 442:random variables 430:Chow–Robbins game 341:{\displaystyle P} 238:{\displaystyle i} 174:{\displaystyle t} 40:secretary problem 2869: 2846: 2842: 2836: 2833: 2830: 2827: 2824: 2821: 2818: 2815: 2812: 2809: 2806: 2803: 2800: 2797: 2794: 2791: 2788: 2785: 2782: 2779: 2776: 2773: 2770: 2767: 2764: 2761: 2758: 2755: 2752: 2749: 2746: 2743: 2740: 2737: 2734: 2731: 2728: 2725: 2722: 2719: 2716: 2713: 2710: 2707: 2704: 2701: 2698: 2695: 2692: 2689: 2686: 2683: 2680: 2677: 2674: 2671: 2668: 2665: 2662: 2659: 2656: 2653: 2650: 2647: 2644: 2641: 2638: 2635: 2632: 2629: 2626: 2623: 2620: 2617: 2614: 2611: 2608: 2605: 2602: 2599: 2596: 2593: 2590: 2587: 2584: 2581: 2578: 2575: 2572: 2569: 2566: 2563: 2560: 2557: 2554: 2551: 2548: 2545: 2542: 2539: 2536: 2533: 2530: 2527: 2524: 2521: 2518: 2515: 2512: 2509: 2506: 2503: 2497: 2481: 2480: 2448: 2442: 2441: 2410: 2404: 2403: 2393: 2369: 2363: 2362: 2344: 2335:(4): 1333–1344. 2320: 2314: 2313: 2303: 2276: 2270: 2269: 2237: 2231: 2230: 2198: 2192: 2185: 2179: 2178: 2172: 2164: 2162: 2150: 2139: 2138: 2128: 2105:Robbins, Herbert 2100: 2094: 2093: 2083: 2074:(4): 1041–1058. 2053: 2047: 2046: 2036: 2011:Bruss, F. Thomas 2007: 2001: 2000: 1982: 1952: 1946: 1945: 1933: 1913: 1907: 1906: 1888: 1855: 1849: 1848: 1838: 1813:Bruss, F. Thomas 1809: 1803: 1802: 1800: 1766: 1751:Robbins' problem 1720:optimal stopping 1705: 1703: 1702: 1697: 1695: 1691: 1690: 1689: 1688: 1684: 1667: 1661: 1660: 1659: 1654: 1652: 1648: 1641: 1612: 1600: 1587: 1582: 1569: 1568: 1549: 1547: 1546: 1541: 1539: 1538: 1495: 1493: 1492: 1487: 1485: 1484: 1453: 1451: 1450: 1445: 1424: 1422: 1421: 1416: 1392: 1390: 1389: 1384: 1360: 1358: 1357: 1352: 1322: 1320: 1319: 1314: 1299: 1297: 1296: 1291: 1277: 1276: 1264: 1263: 1247: 1245: 1244: 1239: 1237: 1236: 1201: 1199: 1198: 1193: 1181: 1179: 1178: 1173: 1171: 1167: 1166: 1162: 1136: 1135: 1131: 1115: 1109: 1108: 1107: 1102: 1091: 1064: 1056: 1045: 1040: 1032: 1031: 1009: 1007: 1006: 1001: 979: 977: 976: 971: 963: 962: 958: 953: 952: 928: 923: 914: 910: 909: 908: 875: 873: 872: 867: 855: 853: 852: 847: 833: 828: 826: 821: 820: 810: 791: 789: 788: 783: 771: 769: 768: 763: 740: 738: 737: 732: 730: 729: 714: 713: 698: 697: 685: 677: 668: 666: 665: 660: 646: 645: 633: 632: 616: 614: 613: 608: 592: 590: 589: 584: 572: 570: 569: 564: 559: 558: 543: 542: 530: 522: 513: 511: 510: 505: 493: 491: 490: 485: 471: 470: 458: 457: 425: 423: 422: 417: 393: 391: 390: 385: 373: 371: 370: 365: 347: 345: 344: 339: 327: 325: 324: 319: 317: 316: 300: 298: 297: 292: 275: 261: 260: 244: 242: 241: 236: 221: 219: 218: 213: 180: 178: 177: 172: 160: 158: 157: 152: 131: 129: 128: 123: 68:random variables 31:optimal stopping 2877: 2876: 2872: 2871: 2870: 2868: 2867: 2866: 2852: 2851: 2850: 2849: 2843: 2839: 2835: 2834: 2831: 2828: 2825: 2822: 2819: 2816: 2813: 2810: 2807: 2804: 2801: 2798: 2795: 2792: 2789: 2786: 2783: 2780: 2777: 2774: 2771: 2768: 2765: 2762: 2759: 2756: 2753: 2750: 2747: 2744: 2741: 2738: 2735: 2732: 2729: 2726: 2723: 2720: 2717: 2714: 2711: 2708: 2705: 2702: 2699: 2696: 2693: 2690: 2687: 2684: 2681: 2678: 2675: 2672: 2669: 2666: 2663: 2660: 2657: 2654: 2651: 2648: 2645: 2642: 2639: 2636: 2633: 2630: 2627: 2624: 2621: 2618: 2615: 2612: 2609: 2606: 2603: 2600: 2597: 2594: 2591: 2588: 2585: 2582: 2579: 2576: 2573: 2570: 2567: 2564: 2561: 2558: 2555: 2552: 2549: 2546: 2543: 2540: 2537: 2534: 2531: 2528: 2525: 2522: 2519: 2517:scipy.integrate 2516: 2513: 2510: 2507: 2504: 2501: 2498: 2494: 2489: 2484: 2449: 2445: 2418:Wästlund, Johan 2414:Häggström, Olle 2411: 2407: 2370: 2366: 2321: 2317: 2294:(3): 993–1010. 2277: 2273: 2238: 2234: 2199: 2195: 2191:. Vol. 1. 1967. 2186: 2182: 2166: 2165: 2151: 2142: 2101: 2097: 2054: 2050: 2008: 2004: 1980:10.2307/1428183 1953: 1949: 1942: 1914: 1910: 1859:Bruss, F.Thomas 1856: 1852: 1810: 1806: 1767: 1763: 1759: 1735:Herbert Robbins 1732: 1711: 1680: 1673: 1669: 1668: 1653: 1637: 1618: 1614: 1613: 1611: 1596: 1581: 1577: 1573: 1564: 1560: 1555: 1552: 1551: 1534: 1530: 1501: 1498: 1497: 1480: 1476: 1462: 1459: 1458: 1433: 1430: 1429: 1398: 1395: 1394: 1366: 1363: 1362: 1328: 1325: 1324: 1308: 1305: 1304: 1272: 1268: 1259: 1255: 1253: 1250: 1249: 1232: 1228: 1226: 1223: 1222: 1215: 1187: 1184: 1183: 1158: 1151: 1147: 1143: 1127: 1120: 1116: 1101: 1087: 1065: 1063: 1052: 1039: 1027: 1023: 1021: 1018: 1017: 989: 986: 985: 954: 948: 944: 934: 930: 924: 919: 904: 900: 893: 889: 881: 878: 877: 861: 858: 857: 827: 822: 816: 812: 806: 800: 797: 796: 777: 774: 773: 757: 754: 753: 750: 725: 721: 709: 705: 693: 689: 676: 674: 671: 670: 641: 637: 628: 624: 622: 619: 618: 602: 599: 598: 578: 575: 574: 554: 550: 538: 534: 521: 519: 516: 515: 499: 496: 495: 466: 462: 453: 449: 447: 444: 443: 432: 399: 396: 395: 379: 376: 375: 353: 350: 349: 333: 330: 329: 312: 308: 306: 303: 302: 271: 256: 252: 250: 247: 246: 230: 227: 226: 186: 183: 182: 166: 163: 162: 137: 134: 133: 108: 105: 104: 82: 65: 56: 36:Herbert Robbins 21: 18:Robbins algebra 12: 11: 5: 2875: 2865: 2864: 2848: 2847: 2837: 2529:scipy.optimize 2500: 2491: 2490: 2488: 2485: 2483: 2482: 2463:(2): 571–583. 2443: 2405: 2364: 2315: 2271: 2252:(2): 347–354. 2232: 2213:(4): 361–368. 2193: 2180: 2140: 2119:(3): 444–454. 2095: 2048: 2002: 1973:(3): 828–852. 1955:Assaf, David; 1947: 1940: 1908: 1879:(3): 616–626. 1850: 1829:(1): 108–120. 1804: 1760: 1758: 1755: 1731: 1728: 1710: 1707: 1694: 1687: 1683: 1679: 1676: 1672: 1664: 1657: 1651: 1647: 1644: 1640: 1636: 1633: 1630: 1627: 1624: 1621: 1617: 1608: 1603: 1599: 1595: 1592: 1585: 1580: 1576: 1572: 1567: 1563: 1559: 1537: 1533: 1529: 1526: 1523: 1520: 1517: 1514: 1511: 1508: 1505: 1483: 1479: 1475: 1472: 1469: 1466: 1443: 1440: 1437: 1414: 1411: 1408: 1405: 1402: 1382: 1379: 1376: 1373: 1370: 1350: 1347: 1344: 1341: 1338: 1335: 1332: 1312: 1289: 1286: 1283: 1280: 1275: 1271: 1267: 1262: 1258: 1235: 1231: 1214: 1208: 1191: 1170: 1165: 1161: 1157: 1154: 1150: 1146: 1142: 1139: 1134: 1130: 1126: 1123: 1119: 1112: 1105: 1100: 1097: 1094: 1090: 1086: 1083: 1080: 1077: 1074: 1071: 1068: 1062: 1059: 1055: 1051: 1048: 1043: 1038: 1035: 1030: 1026: 999: 996: 993: 982:Wiener process 969: 966: 961: 957: 951: 947: 943: 940: 937: 933: 927: 922: 918: 913: 907: 903: 899: 896: 892: 888: 885: 865: 845: 842: 839: 836: 831: 825: 819: 815: 809: 805: 781: 761: 749: 743: 728: 724: 720: 717: 712: 708: 704: 701: 696: 692: 688: 683: 680: 658: 655: 652: 649: 644: 640: 636: 631: 627: 606: 582: 562: 557: 553: 549: 546: 541: 537: 533: 528: 525: 503: 483: 480: 477: 474: 469: 465: 461: 456: 452: 431: 428: 415: 412: 409: 406: 403: 383: 363: 360: 357: 337: 315: 311: 290: 287: 284: 281: 278: 274: 270: 267: 264: 259: 255: 234: 211: 208: 205: 202: 199: 196: 193: 190: 170: 150: 147: 144: 141: 121: 118: 115: 112: 78: 61: 54: 34:, named after 9: 6: 4: 3: 2: 2874: 2863: 2860: 2859: 2857: 2841: 2496: 2492: 2478: 2474: 2470: 2466: 2462: 2458: 2454: 2447: 2439: 2435: 2431: 2427: 2423: 2419: 2415: 2409: 2401: 2397: 2392: 2387: 2383: 2379: 2375: 2368: 2360: 2356: 2352: 2348: 2343: 2338: 2334: 2330: 2326: 2319: 2311: 2307: 2302: 2297: 2293: 2289: 2285: 2282:(June 1969). 2281: 2275: 2267: 2263: 2259: 2255: 2251: 2247: 2243: 2236: 2228: 2224: 2220: 2216: 2212: 2208: 2204: 2197: 2190: 2184: 2176: 2170: 2161: 2156: 2149: 2147: 2145: 2136: 2132: 2127: 2122: 2118: 2114: 2110: 2106: 2103:Chow, Y. S.; 2099: 2091: 2087: 2082: 2077: 2073: 2069: 2068: 2063: 2059: 2052: 2044: 2040: 2035: 2030: 2026: 2022: 2021: 2016: 2012: 2006: 1998: 1994: 1990: 1986: 1981: 1976: 1972: 1968: 1967: 1962: 1958: 1951: 1943: 1937: 1932: 1927: 1923: 1919: 1912: 1904: 1900: 1896: 1892: 1887: 1882: 1878: 1874: 1873: 1868: 1864: 1860: 1854: 1846: 1842: 1837: 1832: 1828: 1824: 1823: 1818: 1814: 1808: 1799: 1794: 1790: 1786: 1785: 1780: 1776: 1772: 1765: 1761: 1754: 1752: 1748: 1744: 1740: 1736: 1727: 1725: 1721: 1716: 1706: 1692: 1685: 1681: 1677: 1674: 1670: 1662: 1655: 1649: 1642: 1638: 1634: 1631: 1625: 1622: 1619: 1615: 1606: 1601: 1597: 1593: 1590: 1583: 1578: 1574: 1570: 1565: 1561: 1535: 1531: 1524: 1518: 1515: 1512: 1506: 1503: 1481: 1477: 1473: 1470: 1467: 1464: 1455: 1441: 1438: 1435: 1426: 1412: 1409: 1406: 1403: 1400: 1380: 1377: 1374: 1371: 1368: 1345: 1342: 1339: 1333: 1330: 1310: 1301: 1287: 1284: 1281: 1278: 1273: 1269: 1265: 1260: 1256: 1233: 1229: 1220: 1213: 1207: 1205: 1189: 1168: 1163: 1159: 1155: 1152: 1148: 1144: 1140: 1137: 1132: 1128: 1124: 1121: 1117: 1110: 1103: 1092: 1088: 1084: 1081: 1075: 1072: 1069: 1060: 1057: 1053: 1049: 1046: 1041: 1036: 1033: 1028: 1024: 1014: 1011: 991: 983: 967: 964: 959: 955: 949: 945: 941: 938: 935: 931: 920: 916: 911: 905: 901: 897: 894: 890: 886: 883: 863: 843: 840: 837: 834: 829: 823: 817: 813: 807: 793: 779: 759: 748: 742: 726: 722: 718: 710: 706: 702: 699: 694: 690: 681: 678: 656: 653: 650: 647: 642: 638: 634: 629: 625: 604: 594: 580: 555: 551: 547: 544: 539: 535: 526: 523: 501: 481: 478: 475: 472: 467: 463: 459: 454: 450: 441: 435: 427: 413: 410: 407: 404: 401: 381: 361: 358: 355: 335: 313: 309: 285: 282: 279: 272: 268: 265: 262: 257: 253: 232: 223: 209: 206: 200: 194: 191: 188: 168: 145: 139: 116: 110: 101: 99: 95: 91: 84: 81: 77: 73: 69: 64: 60: 53: 47: 45: 41: 37: 33: 32: 26: 19: 2840: 2495: 2460: 2456: 2446: 2429: 2425: 2408: 2384:(1): 46–50. 2381: 2377: 2367: 2332: 2328: 2318: 2291: 2287: 2280:Shepp, L. A. 2274: 2249: 2245: 2235: 2210: 2206: 2196: 2188: 2183: 2116: 2112: 2098: 2071: 2065: 2051: 2024: 2018: 2005: 1970: 1964: 1950: 1921: 1911: 1876: 1870: 1853: 1826: 1820: 1807: 1791:(2): 81–90. 1788: 1782: 1764: 1750: 1746: 1738: 1733: 1712: 1456: 1427: 1302: 1218: 1216: 1211: 1015: 1012: 844:0.8399236757 794: 751: 746: 596: 437: 433: 224: 102: 97: 93: 89: 86: 79: 75: 62: 58: 51: 49: 28: 22: 2432:(10): 893. 2027:(1): 1–18. 795:With this, 2169:cite arXiv 2160:2205.13499 1757:References 1709:Importance 245:such that 2487:Footnotes 2477:0021-9002 2400:0002-9904 2351:0003-4851 2310:0003-4851 2266:0304-4149 2227:1432-2064 2135:0019-2082 1989:0001-8678 1895:0021-9002 1675:− 1663:π 1656:α 1632:− 1626:ζ 1620:− 1591:− 1579:α 1558:Δ 1528:Δ 1525:≥ 1516:− 1507:− 1474:× 1468:≤ 1439:≤ 1410:− 1378:− 1372:≤ 1343:− 1230:β 1190:ζ 1153:− 1122:− 1111:π 1104:α 1082:− 1076:ζ 1070:− 1047:− 1037:α 1025:β 998:∞ 995:→ 968:λ 946:λ 942:− 939:α 936:λ 926:∞ 917:∫ 902:α 898:− 884:α 864:α 838:α 835:≈ 814:β 723:β 719:≥ 703:⋯ 639:β 626:β 548:⋯ 408:α 382:α 207:≤ 192:≤ 2856:Category 2799:solution 2781:solution 2754:solution 2724:equation 2712:solution 2679:integral 2619:integral 2607:equation 2420:(2013). 2090:27793918 2060:(2009). 2043:30040773 1959:(1996). 1865:(1993). 1845:30040773 1815:(2005). 1777:(1964). 1693:⌉ 1575:⌈ 856:, where 57:, ... , 44:expected 2760:success 2730:0.83992 2586:lambda_ 2574:lambda_ 2547:lambda_ 2359:2239702 1997:1428183 1903:3214770 1743:Amherst 1730:History 1202:is the 210:2.33183 72:uniform 2811:" 2676:return 2559:return 2532:import 2520:import 2502:import 2475:  2398:  2357:  2349:  2308:  2264:  2225:  2133:  2088:  2041:  1995:  1987:  1938:  1901:  1893:  1843:  1442:489241 1182:where 573:where 2823:print 2766:print 2742:1e-15 2709:alpha 2694:alpha 2670:alpha 2625:error 2613:alpha 2580:alpha 2553:alpha 2505:numpy 2355:JSTOR 2155:arXiv 2086:JSTOR 2039:JSTOR 1993:JSTOR 1899:JSTOR 1841:JSTOR 1550:where 1217:When 2817:else 2718:root 2661:args 2631:quad 2535:root 2526:from 2523:quad 2514:from 2473:ISSN 2396:ISSN 2347:ISSN 2306:ISSN 2262:ISSN 2223:ISSN 2175:link 2131:ISSN 1985:ISSN 1936:ISBN 1891:ISSN 1722:and 1471:9.06 1404:> 411:< 405:< 359:< 263:< 50:Let 2805:fun 2736:tol 2655:inf 2604:def 2568:exp 2538:def 2465:doi 2434:doi 2430:120 2386:doi 2337:doi 2296:doi 2254:doi 2215:doi 2121:doi 2076:doi 2029:doi 1975:doi 1926:doi 1881:doi 1831:doi 1793:doi 1741:in 804:lim 752:If 440:IID 92:as 23:In 2858:: 2751:if 2697:** 2673:)) 2649:np 2616:): 2589:** 2562:np 2556:): 2511:np 2508:as 2471:. 2461:59 2459:. 2455:. 2428:. 2424:. 2416:; 2394:. 2382:75 2380:. 2376:. 2353:. 2345:. 2333:39 2331:. 2327:. 2304:. 2292:40 2290:. 2286:. 2260:. 2250:32 2248:. 2244:. 2221:. 2209:. 2205:. 2171:}} 2167:{{ 2143:^ 2129:. 2115:. 2111:. 2084:. 2072:41 2070:. 2064:. 2037:. 2025:46 2023:. 2017:. 1991:. 1983:. 1971:28 1969:. 1963:. 1934:. 1897:. 1889:. 1877:30 1875:. 1869:. 1861:; 1839:. 1827:42 1825:. 1819:. 1787:. 1781:. 1773:; 1726:. 1478:10 1454:. 1206:. 1164:24 741:. 394:, 348:, 181:, 70:, 27:, 2832:) 2826:( 2820:: 2814:) 2808:} 2802:. 2796:{ 2790:} 2787:x 2784:. 2778:{ 2772:f 2769:( 2763:: 2757:. 2745:) 2739:= 2733:, 2727:, 2721:( 2715:= 2706:- 2703:) 2700:2 2691:- 2688:1 2685:( 2682:* 2667:( 2664:= 2658:, 2652:. 2646:, 2643:0 2640:, 2637:f 2634:( 2628:= 2622:, 2610:( 2601:) 2598:2 2595:/ 2592:2 2583:- 2577:* 2571:( 2565:. 2550:, 2544:( 2541:f 2479:. 2467:: 2440:. 2436:: 2402:. 2388:: 2361:. 2339:: 2312:. 2298:: 2268:. 2256:: 2229:. 2217:: 2211:5 2177:) 2163:. 2157:: 2137:. 2123:: 2117:9 2092:. 2078:: 2045:. 2031:: 1999:. 1977:: 1944:. 1928:: 1905:. 1883:: 1847:. 1833:: 1801:. 1795:: 1789:2 1686:4 1682:/ 1678:1 1671:n 1650:) 1646:) 1643:2 1639:/ 1635:1 1629:( 1623:2 1616:( 1607:+ 1602:2 1598:/ 1594:1 1584:n 1571:= 1566:n 1562:k 1536:n 1532:k 1522:) 1519:k 1513:n 1510:( 1504:k 1482:7 1465:n 1436:n 1413:k 1407:n 1401:k 1381:k 1375:n 1369:k 1349:) 1346:k 1340:n 1337:( 1334:, 1331:k 1311:n 1288:. 1285:. 1282:. 1279:, 1274:2 1270:X 1266:, 1261:1 1257:X 1234:n 1219:n 1212:n 1169:) 1160:/ 1156:7 1149:n 1145:( 1141:O 1138:+ 1133:4 1129:/ 1125:1 1118:n 1099:) 1096:) 1093:2 1089:/ 1085:1 1079:( 1073:2 1067:( 1061:+ 1058:2 1054:/ 1050:1 1042:n 1034:= 1029:n 992:n 965:d 960:2 956:/ 950:2 932:e 921:0 912:) 906:2 895:1 891:( 887:= 841:= 830:n 824:/ 818:n 808:n 780:F 760:F 747:n 727:n 716:) 711:n 707:X 700:+ 695:1 691:X 687:( 682:n 679:1 657:. 654:. 651:. 648:, 643:2 635:, 630:1 605:F 581:n 561:) 556:n 552:X 545:+ 540:1 536:X 532:( 527:n 524:1 502:F 482:. 479:. 476:. 473:, 468:2 464:X 460:, 455:1 451:X 414:1 402:0 362:1 356:P 336:P 314:i 310:R 289:) 286:i 283:+ 280:n 277:( 273:/ 269:c 266:i 258:i 254:R 233:i 204:) 201:t 198:( 195:w 189:1 169:t 149:) 146:t 143:( 140:w 120:) 117:t 114:( 111:w 98:v 94:n 90:v 80:k 76:X 63:n 59:X 55:1 52:X 20:.

Index

Robbins algebra
probability theory
optimal stopping
Herbert Robbins
secretary problem
expected
random variables
uniform
IID
Wiener process
Riemann zeta function
secretary problems
optimal stopping
sequential analysis
Herbert Robbins
Amherst
Robbins, Herbert Ellis
Samuels, Stephen M.
"Optimal Selection Based on Relative Rank"
Israel Journal of Mathematics
doi
10.1007/bf02759948
Bruss, F. Thomas
"What is known about Robbins' Problem?"
Journal of Applied Probability
doi
10.1239/jap/1110381374
JSTOR
30040773
Bruss, F.Thomas

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