r-project.org] on behalf
of Jari Oksanen [jari.oksa...@oulu.fi]
Sent: 23 May 2012 13:51
To: r-de...@stat.math.ethz.ch
Subject: [Rd] prcomp with previously scaled data: predict with 'newdata'
wrong
Hello folks,
it may be regarded as a user error to scale() your data prior to
Hello folks,
it may be regarded as a user error to scale() your data prior to prcomp()
instead of using its 'scale.' argument. However, it is a user thing that may
happen and sounds a legitimate thing to do, but in that case predict() with
'newdata' can give wrong results:
x <- scale(USArrests
