rees@usage.csd.unsw.oz.au (Rees Griffiths) (10/30/90)
Subject: Help with finding a paper if anybody can recognize the formula
Newsgroups: bionet.population-bio
I was wondering if anybody could help me with finding a source
paper.
I was asked to write a program last year and was given a paper
which supplied a method for calculating Chi^2 values in a heterogeneity
of genotypic frequencies test. The users now do not what the reference was
and as I was simply writing a program for them I didn't record the reference
either. The closest I could find in their papers was one by Waples R.S.
1987. Evolution 41(2) 385-400. However while the Degrees of freedom
match, the Chi^2 does not. Looking up some of that papers references didn't
help.
The formula's from my source code are as follows
d of f = (No. of alleles at the locus - 1)*(No. of populations -1)
Chi^2 = 2 * (No. of individuals sampled at the locus from all
populations) * (Weighed variance/weighted mean)
where
weighted mean of the allele frequencies
= sum across populations of
No. of individuals scored in a population divided by
Total individuals scored * allele frequency
and
weighted variance of the allele frequencies
= sum across populations of
as above except allele frequency is squared
minus
the square of the weighted mean
I know this is a LONG SHOT. But if anybody recognises the above I would
appreciate hearing from them at my email address
bi_rees@vaxa.mqcc.mq.oz.au
Thanks for reading this far.
Rees