Hi, in principle I took as a reference the PISA Data Analysis Manual, SAS, second edition, 2009. I started from the basics, regressions, then regressions with plausible values. I copied the logic and developed it in R. It was not easy. I have taken a course in SAS Macro Language, as well as R and multilevel models. I am currently doing the same with Multilevel. I am in the same book, chapter 15. multilevel regression model with random intercepts and fixed slopes. I already know how to do with a only one plausible value, in an example from the book with Belgium 2006 science. I am just standing in Box 15.3 [1/2] , page 211 Walter, walbornoz_the_one@yahoo.com
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