Hi listers, I have a statistical question corcerning the posteriori probability of a discriminant analysis. I am calculating the probabilities under R using the formula. posteriori_j=exp(q_j(y))/sum(q_j(y)) qj(y) is my quadratic discriminant function for the case where my covariance matrix are proportional with y=(y1,y2) et j=1,2 groups My doubt is how I could calculate this ratio when my dimension (number of observations) is different for each j group. Thanks in advance, Marcio -- View this message in context: http://www.nabble.com/Discriminant-analysis---posterior-prob-tp22874222p22874222.html Sent from the R help mailing list archive at Nabble.com.