Dear Rusers,
The default behavior in R when performing a regression model with missing
values is to exclude any case that contains a
missing value? How could i set the bahavior that R deal with missing values?
e.g.:
exclude cases listwise
exclude cases pairwise
replace with mean

Thanks very much!

-- 
Kind Regards,
Zhi Jie,Zhang ,PHD
Department of Epidemiology
School of Public Health
Fudan University
Tel:86-21-54237149

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