Hi Anderson-
Thanks! I had looked up on the listserv for prior advice, and made my model based on that (putting in both age and age-squared). The reason I don't want to put in just age alone is that I don't necessarily think the effect here will be linear (based on other data we have). So, I'm really interested in quadratic effects, I just am not sure if I have gone wrong in following the advice from the previous posts, like this one:
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=fsl;5effa6a9.1209
or if what I want to do isn't possible?
thanks,
Katie
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