
Dear R users,

Please help me on using "mix" function under package "mixdist".

My data distribution shows there are two components for the mixture distribution: left part is an exponential and right part is a normal. So I plan to use "gamma" mixture distribution to estimate the parameters. Here is what I am using for the "mix" function.

Test<-mix(x, mixparam(mu=c(1,125),sigma=c(1,11.18)),"gamma") 

However, one error message shows up as:
"Error in nlm(function(x) f(x, ...), p, hessian, typsize, fscale, msg,  : missing value in parameter"

Does anybody know what that means and how to fix it to get the estimation? Your help will be much appreciated.

Yun


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Yun Wang
Research Assistant
Department of Family Medicine and Public Health Sciences
Wayne State University School of Medicine
177 Shiffman Library
4325 Brush
Detroit, MI 48201
 
Phone: 313-577-0707
Fax:     313-577-1773
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