[R] "chi-square" | "chi-squared" | "chi squared" | "chi, square"

William Dunlap wdun|@p @end|ng |rom t|bco@com
Sat Oct 19 17:59:48 CEST 2019


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 using 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
>
>
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>
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