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Talk:Credible interval

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or Yes ... it is possible to consider the frequency properties (coverage probabilities) of credibility intervals, in which case the ends of a credibility interval are treated as being random when considering the coverage probabilities (ie. via stochastic simulation studies). Of course the ends of the
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In discussing frequentist confidence intervals with colleagues, it seems people want to interpret them as the range of values (read, effect sizes) consistent with the data. It is my vague sense that this is what a Bayesian credible interval actual does describe. If this is true, I think it would be
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I am not a math or stats person. Now, I use Knowledge quite often. Today, reading an article on Reuters I came across the phrase "credibility interval" for the first time. So I go to Knowledge for enlightenment. The article is incomprehensible to me. My impression is that you have to know your
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Perhaps this is as it should be. On the other hand, it could be that the author(s) of the article are all math/stats folks who aren't in the habit of thinking about audience. If the audience for this article is intended to reach the non-specialist, general reader, it doesn't.
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The article mentions "It is possible to frame the choice of a credible interval within decision theory and, in that context, an optimal interval will always be a highest probability density set". I didn't think this was right, so I asked the guys over at cross validated
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I wasn't sure if the article would benefit from an example, to show the different thought-patterns behind credible intervals and confidence intervals. In the end, per NOTATEXTBOOK, I thought not, but perhaps it's useful to place here instead.
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That argument is quite different to the credible-interval calculation, which proceeds by finding the posterior probability, which is equal to the prior times the likelihood,
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For an example that has quite simple arithmetic, consider for instance the following question. Suppose a real-valued random variable is drawn from a uniform distribution,
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good to state that clearly and towards the top (i.e. in terms of how I would "read" a credible interval, and not simply in terms of a definition of one).
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A frequentist confidence interval is a RANDOM interval that contains a FIXED POINT a specified percentage of the time in repeated sampling.
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correspond to the credible interval (even using the appropriate Jeffreys' prior), see eg interval estimation for a binomial proportion,
1347:{\displaystyle \int _{x_{\rm {obs}}}^{\infty }{\frac {1}{n^{2}}}\;{\rm {d}}n=\left_{x_{\rm {obs}}}^{\infty }={\frac {1}{x_{\rm {obs}}}}} 2009:
way around stats to such an extent that if you could understand the article, you wouldn't have come to the article in the first place.
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A credible interval is a FIXED INTERVAL such that the values of a certain RANDOM VARIABLE fall within it with a specified probability.
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as credibility intervals, whereas the ends of a confidence interval are treated as random when confidence intervals are
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http://stats.stackexchange.com/questions/83153/is-this-statement-about-credible-intervals-from-wikipedia-correct
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In this case thereofore the confidence interval and the credible interval coincide; but this is only because
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on Knowledge. If you would like to participate, please visit the project page, where you can join
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The confidence-interval analysis for a 95% interval with two equal tails runs as follows:
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credibility region are treated as fixed when credibility intervals are
490:; this will lead to an interval with end-points that are greater than 1952:; and it is apparent that the logic in each case is very different. 297:; this will lead to an interval with end-points that are less than 929:{\displaystyle \scriptstyle \mathrm {Pr} (n|I)\,\propto \,1/n} 15: 1189:
Integrating this to establish the normalisation, we have that
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This leaves 95% of the time that the interval will cover
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49:It is of interest to the following 2079:Start-Class level-5 vital articles 1916: 1900: 1897: 1881:{\displaystyle \mathrm {Pr} (n|I)} 1857: 1854: 1813: 1810: 1807: 1754: 1741: 1738: 1735: 1714: 1659: 1656: 1653: 1600: 1587: 1584: 1581: 1560: 1488: 1485: 1482: 1457: 1435: 1432: 1429: 1410: 1397: 1394: 1391: 1370: 1336: 1333: 1330: 1311: 1303: 1300: 1297: 1255: 1229: 1221: 1218: 1215: 1165: 1162: 1159: 1141: 1138: 1124: 1092: 1079: 1076: 1073: 1052: 1027: 1024: 1021: 1003: 1000: 979: 976: 973: 952: 886: 883: 867:{\displaystyle \mathrm {Pr} (n|I)} 843: 840: 806: 785: 782: 779: 766: 758: 742: 730: 717: 714: 711: 690: 673:, fulfilling the claim advertised. 639: 636: 633: 583: 550: 540: 537: 534: 446: 443: 440: 390: 357: 347: 344: 341: 271:/0.975; and the right hand end at 14: 2069:Knowledge level-5 vital articles 110:Knowledge:WikiProject Statistics 83: 62: 29: 20: 2104:WikiProject Statistics articles 2094:Start-Class Statistics articles 1888:was the Jeffreys' distribution 130:This article has been rated as 113:Template:WikiProject Statistics 1920: 1911: 1904: 1875: 1868: 1861: 1747: 1725: 1718: 1593: 1571: 1564: 1403: 1381: 1374: 1085: 1063: 1056: 985: 963: 956: 904: 897: 890: 861: 854: 847: 799: 792: 770: 762: 753: 746: 723: 701: 694: 576: 562: 555: 383: 369: 362: 153:Is a credible interval random? 1: 2050:21:51, 13 November 2019 (UTC) 1135: 486:that is greater than 0.975 * 233:16:42, 25 February 2008 (UTC) 157:is credible interval random? 104:and see a list of open tasks. 1996:17:51, 24 January 2014 (UTC) 1972:00:27, 8 December 2010 (UTC) 206:17:51, 8 December 2007 (UTC) 1977:"within decision theory..." 1846:was a scale parameter, and 874:the Jeffreys' distribution 2120: 2064:Start-Class vital articles 293:that is less than 0.025 * 176:) 01:56, 20 September 2007 2029:12:20, 30 July 2016 (UTC) 482:will give an observation 289:will give an observation 223:as confidence intervals. 129: 78: 57: 257:, which is real-valued. 1946: 1882: 1831: 1775: 1677: 1621: 1498: 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51:WikiProjects 34: 221:interpreted 217:interpreted 41:Start-class 2058:Categories 251:x ~ U(0,n) 107:Statistics 98:statistics 70:Statistics 1781:given by 1627:given by 1526:such that 39:is rated 2017:unsigned 2001:Audience 301:/39 ... 225:Melcombe 174:contribs 162:unsigned 2042:Muniche 241:Example 134:on the 1964:Jheald 494:... 39 198:Blaise 47:scale. 1825:0.025 1766:0.975 1671:0.975 1612:0.025 936:gives 651:0.975 607:when 595:0.975 511:i.e. 458:0.025 414:when 402:0.025 318:i.e. 28:This 2046:talk 2025:talk 1992:talk 1968:talk 1519:and 1013:< 229:talk 202:talk 170:talk 126:High 1957:not 276:obs 269:obs 182:No. 2060:: 2048:) 2027:) 1994:) 1970:) 1962:. 1926:∝ 1693:∫ 1539:∫ 1474:≥ 1358:so 1312:∞ 1273:− 1230:∞ 1206:∫ 1151:≥ 1101:∝ 910:∝ 739:∝ 520:∫ 327:∫ 231:) 204:) 172:• 2044:( 2023:( 1990:( 1982:( 1966:( 1939:n 1935:/ 1931:1 1921:) 1917:I 1912:| 1908:n 1905:( 1901:r 1898:P 1876:) 1873:I 1869:| 1865:n 1862:( 1858:r 1855:P 1844:n 1821:/ 1814:s 1811:b 1808:o 1803:x 1799:= 1794:2 1790:n 1769:, 1763:= 1760:n 1755:d 1748:) 1742:s 1739:b 1736:o 1731:x 1726:| 1722:n 1719:( 1715:P 1707:2 1703:n 1697:0 1667:/ 1660:s 1657:b 1654:o 1649:x 1645:= 1640:1 1636:n 1615:, 1609:= 1606:n 1601:d 1594:) 1588:s 1585:b 1582:o 1577:x 1572:| 1568:n 1565:( 1561:P 1553:1 1549:n 1543:0 1524:2 1521:n 1517:1 1514:n 1489:s 1486:b 1483:o 1478:x 1471:n 1466:, 1463:n 1458:d 1447:2 1443:n 1436:s 1433:b 1430:o 1425:x 1419:= 1416:n 1411:d 1404:) 1398:s 1395:b 1392:o 1387:x 1382:| 1378:n 1375:( 1371:P 1337:s 1334:b 1331:o 1326:x 1322:1 1317:= 1304:s 1301:b 1298:o 1293:x 1287:] 1281:n 1278:1 1269:[ 1264:= 1261:n 1256:d 1245:2 1241:n 1237:1 1222:s 1219:b 1216:o 1211:x 1166:s 1163:b 1160:o 1155:x 1148:n 1142:f 1139:i 1133:, 1130:n 1125:d 1114:2 1110:n 1106:1 1098:n 1093:d 1086:) 1080:s 1077:b 1074:o 1069:x 1064:| 1060:n 1057:( 1053:P 1028:s 1025:b 1022:o 1017:x 1010:n 1004:f 1001:i 995:, 992:0 989:= 986:) 980:s 977:b 974:o 969:x 964:| 960:n 957:( 953:P 923:n 919:/ 915:1 905:) 902:I 898:| 894:n 891:( 887:r 884:P 862:) 859:I 855:| 851:n 848:( 844:r 841:P 812:n 807:d 800:) 797:n 793:| 786:s 783:b 780:o 775:x 771:( 767:P 763:) 759:I 754:| 750:n 747:( 743:P 736:n 731:d 724:) 718:s 715:b 712:o 707:x 702:| 698:n 695:( 691:P 671:n 647:/ 640:s 637:b 634:o 629:x 625:= 620:1 616:n 592:= 589:x 584:d 577:) 572:1 568:n 563:| 559:x 556:( 551:P 541:s 538:b 535:o 530:x 524:0 506:. 504:n 500:n 496:n 492:n 488:n 484:x 480:n 454:/ 447:s 444:b 441:o 436:x 432:= 427:2 423:n 399:= 396:x 391:d 384:) 379:2 375:n 370:| 366:x 363:( 358:P 348:s 345:b 342:o 337:x 331:0 313:. 311:n 307:n 303:n 299:n 295:n 291:x 287:n 273:x 266:x 255:n 227:( 200:( 168:( 138:. 53::

Index


level-5 vital article
content assessment
WikiProjects
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Statistics
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WikiProject Statistics
statistics
the discussion
High
importance scale
unsigned
128.100.74.204
talk
contribs
Blaise
talk
17:51, 8 December 2007 (UTC)
Melcombe
talk
16:42, 25 February 2008 (UTC)

Jheald
talk
00:27, 8 December 2010 (UTC)
http://stats.stackexchange.com/questions/83153/is-this-statement-about-credible-intervals-from-wikipedia-correct
66.29.243.106
talk
17:51, 24 January 2014 (UTC)

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