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...or the parameters that describe the beta distribution (a,b) given the mean and variance. mean = a/(a+b) variance = (a*b)/(((a+b)^2) * (a+b+1)) Any help as to where to start would be welcome. -- Scott Story Graduate Student MSU Ecology Department 319 Lewis Hall Bozeman, Mt 59717 406.994.2670 sstory at montana.edu

...na for students to get free information (hadn't even crossed my mind). Just as an aside, I take it that R cannot solve non-linear equations (since you all gave me solutions outside of it). -- Scott Story Graduate Student MSU Ecology Department 319 Lewis Hall Bozeman, Mt 59717 406.994.2670 sstory at montana.edu

...Proc Nlmixed data=Mall tech=quanew method=gauss maxiter=1000; parms B0=0; p=1; do i=0 TO t-1; logit=B0; p=p*(exp(logit)/(1+exp(logit))); end; model ifate~binomial(1,p); -- Scott Story Graduate Student MSU Ecology Department 319 Lewis Hall Bozeman, Mt 59717 406.994.2670 sstory at montana.edu