[R] NLME and NA:s

[Patrik Waldmann]

Hello,

I have an unbalanced data set with some factors and several variables. The missing values are spread unequally over the variables. Because of the unbalanced structure have i tried NLME, but I cannot understand how I should set up the na.omit. I would not like to use na.omit before setting up the model, as that would exclude too many observations (on the whole structure). Lets say I have data frame DATA, factor FACT and variables VAR1,VAR2... I first convert by using factor, and then set up the model as fm1<- lme(VAR1~1, data=DATA, random=~1! FACT,na.omit(DATA$VAR1)). What have I done wrong?

Patrik Waldmann
Department of Systematic botany
University of Lund
Ostra Vallgatan 18-20
223 61 Lund
Sweden
E-mail: Patrik.Waldmann at sysbot.lu.se

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