Dear R experts,
>From ?prcomp,
snip -
Note:
The signs of the columns of the rotation matrix are arbitrary, and
so may differ between different programs for PCA, and even between
different builds of R.
snip --
My problem is that I am building an index based on Pr
Use absolute value
Tim
-Original Message-
From: R-help On Behalf Of Ashim Kapoor
Sent: Wednesday, October 12, 2022 7:48 AM
To: R Help
Subject: [R] prcomp - arbitrary direction of the returned principal components
[External Email]
Dear R experts,
>From ?prcomp,
snip -
Note:
First one needs to remove the extraneous line-ends that you created by using an
editor that inserts those line-ends (or perhaps it was your mail-client that
added them because you failed to post in plain-text. I removed those files "by
hand" and then created a text "file".
txt <- "2015-01-01 00
Dear Aaron,
Many thanks for your reply.
Please allow me to illustrate my query a bit.
I take some data, throw it to prcomp and extract the x data frame from prcomp.
>From ?prcomp:
x: if ‘retx’ is true the value of the rotated data (the centred
(and scaled if requested) data mu
I agree with this and I'm not very sure why you feel you need the signs
fixed one way: they are arbitrary and how they come out is generally a
function of things in the handling of rounding as values hit the limit
of the finite arithmetic in the particular program and OS and hardware
on which it's
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