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Re: st: ln transform and box cox


From   "JVerkuilen (Gmail)" <jvverkuilen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ln transform and box cox
Date   Wed, 6 Mar 2013 20:52:44 -0500

On Wed, Mar 6, 2013 at 7:15 PM, Anthony Fulginiti <fulginit@usc.edu> wrote:
> Although I did not post the initial question, I welcome the helpful book reference.  I have been using the Singer and Willett book, "Applied Longitudinal Data Analysis" but looked at Fitzmaurice website
> and found it to be another great source.  Related to the post:  I followed a similar modeling strategy as Tom (specifying the polynomial function of time that best fit the data first and subsequently adding
> variables of central interest and controls) but plan to reexamine the issue with the explanatory vars in the model.

Regression splines may be a good way to go about getting a flexible
specification for age. If you know that there are a few key ages, put
knots there.


-- 
JVVerkuilen, PhD
jvverkuilen@gmail.com

"It is like a finger pointing away to the moon. Do not concentrate on
the finger or you will miss all that heavenly glory." --Bruce Lee,
Enter the Dragon (1973)
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