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:
http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/CatContinuous
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
Stephan
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