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Talk:Chinese restaurant process

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pages of very, very dense math. Without a page number and/or clarification, the reference provides no value- reading an advanced textbook to guess what is meant when a short definition would suffice is unreasonably onerous. I have a copy of the text, and I'd be happy to rewrite the section/reference if the editor can add more detail. Otherwise, I propose removing the formula entirely as it provides no information beyond the reference- simply saying that the reference contains a derivation for the general case would be clearer.
283: 262: 2215:. Surely, that cannot be an intended part of the definition of this distribution: viz, that it consists almost entirely of empty tables, at which it becomes impossible/forbidden to sit? And heaven help us, if this is correct, then can the article be amended to make it clear that there will be forbidden tables? And state what the fraction of forbidden tables are over time? Personally, I suspect that the definition is just-plain-wrong, but its hard to guess what the correct, intended definition should be. 1558: 1118: 2329: 231: 1081: 1553:{\displaystyle {\begin{aligned}\Pr(B_{2}=B)&={\dfrac {(\theta )_{|B|,0}}{(\theta +1)_{1,1}}}\prod _{b\in B}(1)_{|b|-1,1}={\dfrac {\theta }{\prod _{i=0}^{1}(\theta +1+i)}}\cdot (1)_{1,1}=\\&={\dfrac {\theta }{(\theta +1)(\theta +2)}}\prod _{i=0}^{0}(1+i)=\\&={\dfrac {\theta }{(\theta +1)(\theta +2)}}=\\&\neq {\dfrac {1}{\theta +2}},\end{aligned}}} 21: 2334: 2282:. However the result of this process does not care about table numbering, so assigning customers in this way is equivalent to assigning them to the next empty table. The formal definition is written this way because "the next empty table" is a much more complicated thing to formally define than "table n." 592:
I am a mathematics graduate and it is not obvious to me why the given formula holds. I think that a derivation of the simple, non-generalized case belongs here. I hate it when people say that something "follows immediately" when, in fact, it requires half a hour's thought and a half-page derivation.
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The current formula for the generalized CRP uses the notation of the gamma function extensively, but then notes that the gamma notation is not the usual gamma function without elaboration. The reference is Jim Pitman's "Combinatorial Stochastic Processes", and while it is a great text it is also 250
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I think it should be noted that the names "Chinese restaurant" and "Indian buffet" are rather problematic, and seem to stem from stereotypes in the 1980s. Is there any reason for this to be called a "Chinese restaurant process" and not simply a "restaurant process"? Of course, I understand if
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This is not "a Chinese restaurant process" but "the Chinese Restaurant Process". Knowledge cannot rename this process because that is how it is known in the literature. I'm not sure which stereotypes from the 80s you are referring to. The Knowledge article on
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The formulate is indeed wrong. Instead of |B| it should read |B|-1 in the above quoted section. Since this is properly the most important thing to get right I hope it is okay that I correct the text, see for instance formula 16 of pitmanns paper:
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There is some mistake with the expected number of tables. First, it doesn't depend on alpha. Second, it should go to alpha * log n as n increases, and when theta=1, and that doesn't happen. I think there is somewhere a theta instead of an alpha.
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When the discount parameter is not zero, the number of expected tables is not O(log(n)) but a power law, which is the defining characteristic of the Pitman-Yor Process that is integrated out to get the two parameter CRP.
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anyone might be interested in studying this process. If there is any heuristic or intuitive way to understand the process, it should be mentioned as a non-rigorous way of gaining some insight into its significance.
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I found that the second explanation, in "definition", was easier to understand than the first explanation in the introduction, so I essentially swapped them around. Hope this helps.
187: 738: 84: 507: 2280: 2213: 2169: 2138: 2102: 2045: 2007: 1952: 2075: 1980: 1646:....I still haven't gotten to this. I suspect no one who's actually an expert on the Ewen's formula and the Chinese restaurant process has worked on this article. 1110: 766: 1863: 1859: 1845: 2140:
there is exactly zero probability that anyone will ever sit at that table. That is, once a table is skipped, it will stay unoccupied, forever. Viz. at time
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mathematicians (or anyone else) might be interested in this particular process would still be helpful; the "Applications" section offers a scant few clues.
589:"It is then immediate that the probability assigned to any particular partition (ignoring the order in which customers sit around any particular table) is" 2442: 323: 119: 47: 666:
is the notation inconsistent? for example: n_k is the number of elements in the n-th block... but... |b| is also the number of elements in a block.
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is stated explicitly in the article. Therefore I was surprised by the question above. But now I've made it more explicit by adding a link to
2306: 1661: 1618: 682: 299: 125: 2437: 1686: 473:{\displaystyle {\begin{aligned}\sum _{k=1}^{n}{\frac {\theta }{\theta +k-1}}=\theta \cdot (\Psi (\theta +n)-\Psi (\theta ))\end{aligned}}} 208: 2394: 600: 175: 2373: 2216: 2293: 290: 267: 2104:. Hopefully, it is plain to see that this will result in most tables having exactly zero occupants, and that furthermore, since 139: 70: 740:, which I myself thought appropriate of adding, taking the case α = 0, corresponding to Ewens' distribution, we should have: 144: 60: 169: 2393:
claims the name of the process comes from the custom as practiced in restaurants in Hong Kong, Taiwan, and parts of China.
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The article, as currently written, is either just-plain wrong, or is deeply misleading. The core problem is that it uses
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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https://web.archive.org/20110411124712/http://users.cecs.anu.edu.au/~xzhang/pubDoc/notes/dirichlet_process.pdf
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The process and related distribution seem to be essentially the same topic and so are best covered together.
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I see this comment has been here for several weeks. I just saw it. I'll look at it later this afternoon.
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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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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on 14 July 2020. For the contribution history and old versions of the redirected page, please see
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before doing mass systematic removals. This message is updated dynamically through the template
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Thank you, the change does somewhat improve the article. However, an expanded explanation of
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Forgive me, I don't know much about the notations used here. But even using the convention
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to count both time-steps, and the number of "occupied" tables. It states that, at time
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If you found an error with any archives or the URLs themselves, you can fix them with
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It is not "immediate" that the probability assigned to a particular partition is ...
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The intro to this article currently fails to comply with the Knowledge policy
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tables. Most of those tables will end up being empty. Specifically, table
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after the link to keep me from modifying it. Alternatively, you can add
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http://users.cecs.anu.edu.au/~xzhang/pubDoc/notes/dirichlet_process.pdf
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The intro to this article is currently too technical for most readers
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to keep me off the page altogether. I made the following changes:
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http://www.springerlink.com/content/k175tg8150441520/fulltext.pdf
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The above criticism is still valid. The article should explain
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Expected number of tables in general case needs clarification
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The definition is correct. The distribution will distribute
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When you have finished reviewing my changes, please set the
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that the second person sit at the same table as the first.
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wikipedia is not the right forum for such discussions.
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and that otherwise, the probability of sitting at table
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I have just added archive links to one external link on
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article needs discussion of meaning of this distribution
1799: 42: 28: 559:{\displaystyle O(\theta \log(1+{\frac {n}{\theta }}))} 200: 2248: 2177: 2150: 2110: 2083: 2053: 2015: 1988: 1960: 1933: 1572: 1570: 1524: 1469: 1378: 1286: 1159: 1121: 1092: 1021: 933: 806: 776: 748: 701: 515: 489: 368: 1112:, assuming only one occupied table with both people 294:, a collaborative effort to improve the coverage of 2077:is the number of people currently sitting at table 1858:using the archive tool instructions below. Editors 2274: 2207: 2163: 2132: 2096: 2069: 2039: 2001: 1974: 1946: 1605: 1564:which I get by directly computing the probability 1552: 1104: 1075: 760: 732: 558: 501: 472: 1126: 777: 73:for general discussion of the article's subject. 633:How, or in what circumstances, is it useful? -- 1844:This message was posted before February 2018. 214: 8: 1915:Formal definition appears to be incorrect!! 46:; for the discussion at that location, see 2367: 2283: 256: 2264: 2247: 2191: 2186: 2178: 2176: 2155: 2149: 2119: 2111: 2109: 2088: 2082: 2062: 2054: 2052: 2029: 2024: 2016: 2014: 1993: 1987: 1964: 1959: 1938: 1932: 1606:{\displaystyle {\dfrac {|b|}{n+\theta }}} 1583: 1575: 1571: 1569: 1523: 1468: 1433: 1422: 1377: 1351: 1307: 1296: 1285: 1263: 1255: 1254: 1232: 1212: 1181: 1173: 1172: 1158: 1136: 1122: 1120: 1091: 1039: 1028: 1020: 1005: 976: 946: 932: 910: 902: 901: 879: 859: 828: 820: 819: 805: 787: 775: 747: 712: 700: 540: 514: 488: 394: 388: 377: 369: 367: 1679:(quoted within main body of the text). 629:What is the application of this formula? 258: 228: 1927:, the probability of sitting at table 691:Does the generalization actually work? 2307:Chinese restaurant table distribution 29:Chinese restaurant table distribution 7: 2328: 288:This article is within the scope of 247:It is of interest to the following 63:for discussing improvements to the 2443:Low-importance Statistics articles 483:is stated to be for the case with 451: 430: 14: 2290:2620:0:1008:14:9074:BB74:7F7:7432 2242:will be empty with a probability 1798:. Please take a moment to review 2332: 2327: 308:Knowledge:WikiProject Statistics 281: 260: 229: 85:Click here to start a new topic. 19: 2448:WikiProject Statistics articles 328:This article has been rated as 311:Template:WikiProject Statistics 2261: 2249: 2187: 2179: 2120: 2112: 2063: 2055: 2025: 2017: 1777:16:03, 26 September 2014 (UTC) 1751:15:27, 26 September 2014 (UTC) 1695:12:13, 24 September 2012 (UTC) 1584: 1576: 1502: 1490: 1487: 1475: 1451: 1439: 1411: 1399: 1396: 1384: 1348: 1341: 1331: 1313: 1264: 1256: 1251: 1244: 1209: 1196: 1182: 1174: 1169: 1162: 1148: 1129: 1002: 995: 973: 960: 943: 936: 911: 903: 898: 891: 856: 843: 829: 821: 816: 809: 799: 780: 709: 702: 553: 550: 531: 519: 463: 460: 454: 445: 433: 427: 1: 2403:04:45, 7 September 2022 (UTC) 2382:15:04, 6 September 2022 (UTC) 609:00:58, 31 December 2011 (UTC) 302:and see a list of open tasks. 82:Put new text under old text. 2424:07:07, 18 January 2023 (UTC) 2322:16:24, 7 November 2019 (UTC) 2298:18:23, 15 October 2019 (UTC) 1910:07:08, 15 January 2016 (UTC) 580:06:53, 18 January 2023 (UTC) 2438:C-Class Statistics articles 2225:01:59, 18 August 2018 (UTC) 1670:14:41, 31 August 2010 (UTC) 1656:16:57, 27 August 2010 (UTC) 1642:15:08, 17 August 2010 (UTC) 733:{\displaystyle (a)_{0,c}=1} 643:That it is relevant to the 90:New to Knowledge? Welcome! 2464: 1875:(last update: 5 June 2024) 1816:|deny=InternetArchiveBot}} 1796:Chinese restaurant process 1791:Hello fellow Wikipedians, 1733:01:28, 3 August 2014 (UTC) 65:Chinese restaurant process 38:Chinese restaurant process 2355:16:04, 14 July 2020 (UTC) 1627:19:05, 27 July 2010 (UTC) 656:15:01, 25 July 2006 (UTC) 638:13:54, 25 July 2006 (UTC) 624:21:41, 27 June 2006 (UTC) 502:{\displaystyle \alpha =0} 327: 276: 255: 120:Be welcoming to newcomers 2275:{\displaystyle (n-1)/n} 2208:{\displaystyle |b|/n=0} 1787:External links modified 2276: 2209: 2165: 2134: 2098: 2071: 2041: 2003: 1976: 1948: 1607: 1554: 1438: 1312: 1106: 1077: 1044: 762: 734: 645:Ewens sampling formula 560: 503: 474: 393: 291:WikiProject Statistics 237:This article is rated 115:avoid personal attacks 2277: 2210: 2166: 2164:{\displaystyle B_{n}} 2144:, if no one sits at 2135: 2133:{\displaystyle |b|=0} 2099: 2097:{\displaystyle B_{k}} 2072: 2042: 2040:{\displaystyle |b|/n} 2004: 2002:{\displaystyle B_{k}} 1977: 1949: 1947:{\displaystyle B_{n}} 1615:Anyone knows better? 1608: 1555: 1418: 1292: 1107: 1078: 1024: 763: 735: 561: 504: 475: 373: 140:Neutral point of view 26:The contents of the 2305:Proposed merge with 2246: 2175: 2148: 2108: 2081: 2051: 2013: 1986: 1958: 1931: 1856:regular verification 1841:to let others know. 1802:. 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179:· 173:· 168:( 98:. 50:.

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