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...case is written ~1|x which tells the function that the variance is fixed and depends on the x-values. Any ideas for how to specify different fixed variances for certain x-values? Thanks Joanne Ellis -- View this message in context: http://r.789695.n4.nabble.com/Fixed-variance-structure-for-lme-tp2955239p2955239.html Sent from the R help mailing list archive at Nabble.com.