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How to compare two frequency distributions

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#1 roelq



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Posted 14 November 2013 - 01:43 AM



I would like to compare two frequency distributions, to know whether they are statistically different. I've seen a number of tests that have been used in papers

(e.g. Fisher's exact, Chi squared, Kolmogorov-Smirnov,...), but I have some doubts on their validity.


Could anyone of you please help me out here?





#2 bob1


    Thelymitra pulchella

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Posted 14 November 2013 - 12:06 PM

Try looking here: http://udel.edu/~mcd.../statintro.html

#3 hobglobin


    Growing old is mandatory, growing up is optional...

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Posted 15 November 2013 - 08:55 AM

As far as I know all mentioned tests are good and reliable (and accepted by journals when you publish). Today Fisher's exact test seems to be preferable especially for smaller sample numbers, with larger sample numbers there is no difference to Chi squared test.

Another test which is highly recommended now is the G-test, which I'd use, if the software offers this one (for R a package is available) and if you have not too small sample numbers (too). 

Edited by hobglobin, 15 November 2013 - 09:11 AM.

One must presume that long and short arguments contribute to the same end. - Epicurus
...except casandra's that did belong to the funniest, most interesting and imaginative (or over-imaginative?) ones, I suppose.

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