24 Feb
2014
24 Feb
'14
10:13 a.m.
Hi FreeSurfer Experts,
With age as a continuous variable, qdec can test the linear effect of age. To test the quadratic effect of age, do I just create a curvilinear term like age*age and add into the existing equation?
For example:
original equation: Y = intercept + age + Factor + age*Factor
new equation: Y = intercept + age + Factor + age*Factor + age*age + age*age*Factor
Best, Daniel
-- Daniel (Yung-Jui) Yang, Ph.D. Postdoctoral Researcher Yale Child Study Center New Haven, CT Tel: (203) 737-5454 E-mail: yung-jui.yang@yale.edu