Actually, I think I've spotted it: the link function for sigma is "log" and exp(0.69) is nearly 2 -- the original sigma -RdR -- View this message in context: http://r.789695.n4.nabble.com/low-sigma-in-lognormal-fit-of-gamlss-tp3962480p3962487.html Sent from the R help mailing list archive at Nabble.com.