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linear_age2
2018 Feb 16
0
analysis of covariance and constrained parameters
...uld be
glm(value ~ Age/Cohort -? 1, family =......, data = .....)
glm(value ~ Age/(Cohort + I(Cohort^2)) - 1, family =......, data = .....).
The latter commands would provide estimates of the age-specific
intercept, linear, and quadratic coefficients, as in
value_Age1 <- intercept_Age1 + linear_Age1*Cohort + quad_Age1*Cohort^2
value_Age2 <- intercept_Age2 + linear_Age2*Cohort + quad_Age2*Cohort^2
This is standard. One would choose among the above models via analysis
of variance or AIC.
Now assume that I have external knowledge that tells me that there is NO
influence of Cohort on val...