Thanks for the answer.
Yes indeed, napredict only puts NAs in the right places (ie where
na.action was used). Anyway I realize that I'm much better off dealing
with the missing values prior to the PCA, and R offers many options for
that.
Thanks
Alain
Prof Brian Ripley a écrit :
On Tue, 10 M
On Tue, 10 Mar 2009, Alain Paquette wrote:
Hello all,
I wish to compute site scores using PCA (prcomp) on a matrix with missing
values, for example:
DrainSlopeOrgL
a41NA
b2.5396
c6845
d3912
e3164
...
Where a,b... are site
Hello all,
I wish to compute site scores using PCA (prcomp) on a matrix with
missing values, for example:
DrainSlopeOrgL
a41NA
b2.5396
c6845
d3912
e3164
...
Where a,b... are sites.
The command
> pca<-prcomp(~ Drain + Slope
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