R help - Jul 2004 - fitting gaussian mixtures

Hi R-helpers,

I'm trying to model a univariate as a bi-modal normal mixtures. I need to
estimate the parameters of each gaussian (mean and sd) and their weights.
What's the best way to do this in R?

Thanks,

Xiao-Jun

Xiao-Jun Ma wrote:
> Hi R-helpers,
> 
> I'm trying to model a univariate as a bi-modal normal mixtures. I need
to estimate the parameters of each gaussian (mean and sd) and their weights.
What's the best way to do this in R?
> 
> Thanks,
> 
> Xiao-Jun
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
package:mclust should help.

Please read the posting guide. This question was asked less than two 
weeks ago and the answer should surely be in the mail archives.

--sundar

This seems like such a trivial thing to do:

given a data.frame DF and variables w,v, x,y,z I can do

DF["x"] or DF[c("x","y")]

if I create a vector, mylist = c("x",y")

then I do DF[mylist]

I am not getting x and y, I get something else.


what is the correct way to subset a data.frame by columns using a vector, 
as if I were doing DF["x","y"]?

Peter

Peter Wilkinson wrote:
> This seems like such a trivial thing to do:
> 
> given a data.frame DF and variables w,v, x,y,z I can do
> 
> DF["x"] or DF[c("x","y")]
> 
> if I create a vector, mylist = c("x",y")
> 
> then I do DF[mylist]
> 
> I am not getting x and y, I get something else.
> 
> 
> what is the correct way to subset a data.frame by columns using a 
> vector, as if I were doing DF["x","y"]?
> 
> Peter
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
You want DF[, mylist]. DF[mylist] returns a list. You may want to look 
at "An Introduction to R", which covers this topic.

--sundar

P.S. Please create a new e-mail when posting to the list rather than 
replying to a message and just changing the subject. This is (of course) 
covered in the posting guide.