Sigma squared or sigma square? Hotelling's T-squared or T-square? Bill Dunlap TIBCO Software wdunlap tibco.com
On Sat, Oct 19, 2019 at 7:38 AM Therneau, Terry M., Ph.D. via R-help < r-help@r-project.org> wrote: > Martin, > A fun question. > > Looking back at my oldest books, Feller (1950) used chi-square. > Then I walked down the hall to our little statistics library and looked at > Johnson and > Kotz, "Continous Univariate Distributions", since each chapter therein has > comments about > the history of the distribution. > > a. They use 'chi-square' throughout their history section, tracing the > distribution > back to work in the 1800s. But, those earliest papers apparently didn't > name their > results as chi- whatever, so an "origin" story didn't pan out. > > b. They have 13 pages of references, and for fun I counted the occurence > of variants. > The majority of papers don't have the word in the title at all and the > next most common is > the Greek symbol. Here are the years of the others: > > chi-square: 73 43 65 80 86 73 82 73 69 69 78 64 64 86 65 86 82 82 76 82 > 88 81 74 77 87 > 86 93 69 60 88 88 80 77 41 59 79 31 > chi-squared: 72 76 82 83 89 79 69 67 77 78 69 77 83 88 87 89 78 > chi: 92 73 89 87 > chi-squares: 77 83 > chi-bar-square: 91 > > There doesn't look to be a trend over time. The 1922 Fisher reference > uses the Greek > symbol, by the way. > > Terry T > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.