Hi: Could you please guide me how to do a qq plot for a 3-parameter lognormal curve. Here is an example from VGAM package to fit lognormal curve. I need to do a qq plot to check the fit. Thanks. lambda = 4 y = lambda + rlnorm(n <- 1000, mean=1.5, sd=exp(-0.8)) fit = vglm(y ~ 1, lognormal3, trace=TRUE) Coef(fit) summary(fit) reez __________________________________________________________________ [[elided Yahoo spam]]