mixed-and weights

Hi,

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I?m beginner with R and I hope that someone can help me.

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I need to know how make command weights in mixed-effect model wit random 
intercept. Command weights=xxx is not function in nlme package. But I think 
that this command is commonly used for linear models. 

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Should I use a different package or special command. 

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Thank you for your advice

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Jana ?.
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