[R] Can R handle twin peaks - normal distribution
spencer.graves at pdf.com
Thu Jun 24 16:29:23 CEST 2004
Have you made normal probability plots? Mixtures of a small
number of normal distributions will appear as a collection of straight
line segments with breakpoints related to the mixing percentages, slopes
of the lines proportional to the standard deviations, etc. I don't
understand the math behind this, but some simple simulations will expose
the patterns. See, e.g., McLachlan and Basford (1988) Mixture Models
hope this helps. spencer graves
Unung Istopo Hartanto wrote:
>Yes, I need normal mixtures plotting, because i found my data not normal
>and closer to bimodal.
>Thanks for All, I've installed package "nor1mix". And its solve my
>On Thu, 2004-06-24 at 16:04, Martin Maechler wrote:
>>>>>>>"Unung" == Unung Istopo Hartanto <unung at enciety.com>
>>>>>>> on Thu, 24 Jun 2004 10:49:29 +0700 writes:
>> Unung> Hi R Users, Sorry if its out of topic. I would like
>> Unung> to ask you about twin peaks - normal
>> Unung> distribution. How R can handle it, any example to
>> Unung> explain it in R.
>>It's not off-topic but you didn't really say what you want
>>(read the posting guide as indicated in the last line of this message!)
>>so I guess "Twin Peaks - Normal" means a mixture of two normal
>>There's the small
>>package 'nor1mix' for univariate normal mixtures plotting, RNG
>>etc, and the much more extensive package
>>'mclust' which allows to *estimate* multivariate (now including
>>uni-variate) normal mixture model parameters.
>>Is it what you've wanted?
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