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Re: st: mean centering
From
Jvverkuilen <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: mean centering
Date
Sun, 20 Jan 2013 19:01:48 -0500
Yes, from what I recall from scientific computing, the QR decomposition solves the numerical problems. It effectively centers and orthogonalizes the variables.
Centering is really about interpretation now.
--
JVerkuilen, PhD
Sent from my iPhone.
"Out beyond ideas of wrong-doing and right-doing there is a field. I'll meet you there. When the soul lies down in that grass the world is too full to talk about." ---Rumi
On Jan 20, 2013, at 18:46, "Airey, David C" <[email protected]> wrote:
> .
>
>> Yes, and it's not bad practice most of the time.
>
> I picked up in a recent discussion that mean centering used to be a remedy for computational problems related to collinearity, like when you square or cube continuous variables to allow nonlinearity in regression models. However, modern methods like Q-R decomposition makes this an unnecessary concern and today mean centering helps with interpretation only if that.
>
> Anyone agree with this?
>
> -Dave
>
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