Hello,
I'm also working on a QSAR validation, and would like to confirm that my
multiple least squares regression based on only 4 x-variables out of a pool
of 300 x-variables is significant. I want to apply the y-randomization or
y-scrambling permutation protocol using R, but I have not been able t
That sounds like a particular form of permutation test. If the
"scrambling" is replaced by sampling with replacement (i.e., some data
points can be sampled more than once while others can be left out),
that's the simple (or nonparametric) bootstrap. The goal is to generate
the distribution of the
boun...@r-project.org [mailto:r-help-boun...@r-
>> project.org] On Behalf Of Damjan Krstajic
>> Sent: Friday, March 05, 2010 5:39 PM
>> To: r-help@r-project.org
>> Subject: [R] scientific (statistical) foundation for Y-RANDOMIZATION in
>> regression analysis
>>
>
t; To: r-help@r-project.org
> Subject: [R] scientific (statistical) foundation for Y-RANDOMIZATION in
> regression analysis
>
>
> Dear all,
>
> I am a statistician doing research in QSAR, building regression models
> where the dependent variable is a numerical expression of some
Dear all,
I am a statistician doing research in QSAR, building regression models where
the dependent variable is a numerical expression of some chemical activity and
input variables are chemical descriptors, e.g. molecular weight, number of
carbon atoms, etc.
I am building regression models a
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