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A convenience function that returns the theta parameters for a merMod object.
merMod
thetaExtract(merMod)
a vector of the covariance, theta, parameters from a merMod
a valid merMod object
(fm1 <- lmer(Reaction ~ Days + (Days | Subject), sleepstudy)) thetaExtract(fm1) #(a numeric vector of the covariance parameters)
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