[R] Create subset using variable

[pansophy]

I am trying to create a loop that will perform a series of analyses.  I am
using geeglm from geepack, which fails if there are any null values. 
Creating a subset solves this, but do not seem to be able to set the subset
dynamically based on a changing variable.  

while (j <= y.num) {

     strSubset = as.character(df.IV$IV[j])  #Gives column name in quotes
     df.data.sub = subset(df.data, strSubset>=0)

#subset dataset is not created

 # analyses on subset take place

    j = j + 1
 }

If I type the variable name in the formula it works, so I assume that I am
not creating the variable in a manner that allows it to be evaluated in the
subset function.  Any help would be greatly appreciated!

Michael 

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