[R] mixtools? Fitting two-normal distributions to data where one of the two normal distributions (the one corresponding to lower values of x) is a left-truncated normal distribution.

[Denis Chabot]

Hi John,

I don't know how well it will handle your truncated left distribution, but I use the function Mclust from package mclust to fit a mixture of normal distribution and it works very well. 

Denis
> Le 2015-06-30 à 22:22, John Sorkin <jsorkin at grecc.umaryland.edu> a écrit :
> 
> I am trying to model the mixture of two normal distributions, where x values are in the range of zero to some positive value. I know about mixtools and would use it save for the fact that the the y values from the normal distribution corresponding to the lower values of x (i.e. from zero to x/n) are from what appears to be a left-truncated normal distribution (i.e. the y values are all from the upper half of a normal distribution). The y values from higher values of x (i.e. from x/n to x) all appear to come from a normal distribution. Can someone suggest how to fit two normal distributions where one of the two distributions is left-truncated? Can this be done using mixtools?
> Thank you,
> John 
> 
> John David Sorkin M.D., Ph.D.
> Professor of Medicine
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine
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