Brian Sandle <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > In talk.politics.drugs Szasz <[EMAIL PROTECTED]> wrote: > > Erkki Komulainen <[EMAIL PROTECTED]> wrote in message >news:<atd490$5ql$[EMAIL PROTECTED]>... > >> In sci.stat.edu Brian Sandle <[EMAIL PROTECTED]> wrote: > >> > >> : First mistake: The Pearson product-moment correlation is not a rank > >> : correlation. > >> > >> Spearman's rank correlation IS Pearsons PMC applied to ranks (instead of > >> original raw/z-scores). The above seems to stress the difference in an > >> odd way. > >> > >> Erkki > > > Thanks Erkki! You make me happy I took multivariate statistics. That > > makes Sandle still zero for zero. > > >> _________________________________________________________________ > >> <http://www.helsinki.fi.invalid/people/Erkki.Komulainen/> > > So I have just taken a quick look at a text used for teaching statistics > in universities. That is Bruning and Kintz. It is very good with examples > of calculations using many different methods, including multivariate. And > it has very clear tables of how number of subjects affects the > significance calculation. > > But if you were hurrying, and just looked at the calculation example for > Pearson product moment correlation, you would not see the *assumptions* > you make when using it. Yes you would see that you use it when you have > actual scores attained by each subject, rather than just who is better > than who. And you would see you were working with who is better than who, > without knowing the scores, in Spearman's rank correlation. > > But here is a little question, and I am making it a little ridiculous. > > If you know the scores, then you also have the rank order, best to least. > So you could use either test, if you know the scores. > > Now what Erkki said could be inferred to mean that which test you use > depends on scores or not. > > You use the Spearman test if you do not have scores, but if you have the > scores, why bother with the Pearson test, because you can use the Spearman > anyway, and if you are working by hand, it is about 1/3 the work. Why? > More to it?
Hopefully you're not expecting an answer from me. I'm here to chat dope policy. > > > -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- > http://www.newsfeeds.com - The #1 Newsgroup Service in the World! > -----== Over 80,000 Newsgroups - 16 Different Servers! =----- . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
