[R] using a noisy variable in regression (not an R question)

Stephan Kolassa Stephan.Kolassa at gmx.de
Sat Mar 7 19:25:03 CET 2009

Hi Juliet,

Juliet Hannah schrieb:
> One simple thing to try would be to form categories

Simple but problematic. Frank Harrell put together a wonderful page 
detailing all the issues with categorizing continuous data:

So: keep your data continuous.

Apart from that, I would second John's recommendation to try to get 
samples at the same point in time (and, if it is cortisol, stay away 
from smokers etc.).

Best wishes

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