Dear All, I am trying to translate some code in SAS about longitudinal data in R. I have found among the predefined covariance structures for repeated measures in the PROC MIXED the following: [EMAIL PROTECTED](1). 'Kronecker product structure of the variance–covariance matrixi =dimni (E⊗V),V, where and V, respectively, are (q×q) and (p×p) positive denite matrices. The matrix represents the variance–covariance matrix between the measurements on all response variables at a given time point. It is assumed that it does not depend on a particular time point and is the same for all time points. The matrix V is the correlation matrix of the repeated measures on a given response variable, and is assumed to be the same for all response variables.' Is it possible? TIA Giovanni
-- dr. Giovanni Parrinello External Lecturer Medical Statistics Unit Department of Biomedical Sciences Viale Europa, 11 - 25123 Brescia Italy Tel: +390303717528 Fax: +390303717488 email: [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
