[R] Create subset using variable

[Ben Bolker]

pansophy <mjs2134 <at> columbia.edu> writes:

> 
> 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
>  }
> 
  
  I've answered this on Stack Overflow. While I don't think there
is any formal policy against cross-posting, I (and at least a few
other participants in both lists) deprecate cross-posting because
it leads to redundant effort.

  Ben Bolker