Dear R users: I want to fit my data with zipf distribution using VGAM package, I used the following script: w<-read.csv("the data file path") y<-1:length(w) fit = vglm(y ~ 1, zipf(link=identity, init=0.5), tra=TRUE, weight=w) After run it, I encountered the problem : gharmonic(extra$N, s = ss - 1) : bad input for argument "s" After that, i use the following script to generate a series of data that obey zipf distribution: N<-5 y<-1:N zipf.data<-(y^(-0.5))/sum((1:N)^(-0.5)) and use the zipf.data as the weights, run the following script: fit = vglm (y ~ 1, zipf(link=identity), tra=TRUE, weight=zipf.data) i still got the error: gharmonic(extra$N, s = ss - 1) : bad input for argument "s" How to fix the problem. I only want to fit my data with zipf distribution and get the para s. Thanks in advance. -- View this message in context: http://www.nabble.com/Zipf-distribution-fitting-with-VGAM-tp17248345p17248345.html Sent from the R help mailing list archive at Nabble.com.