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2011 Feb 28
3
Measuring correlations in repeated measures data
...ont dataset from package nlme, where the model is: fit <- lmer(distance ~ age + (1 | Subject), data=Orthodont) I would like to measure the correlation b/t the variable "distance" at different ages such that I would have a matrix of correlation coefficients like the following: age08 age09 age10 age11 age12 age13 age14 age08 1 age09 1 age10 1 age11 1 age12 1 age13 1 age14 1 The idea would be to demonstrate that the correlations b/t...