to overcome error while computing sd for each subset of data (PR#9931)

Full_Name: Anjali Shitole
Version: R 2.5.1
OS: 
Submission from: (NULL) (202.141.157.91)

  [snip]

Please help me to overcome this error.

Dear Mr. Shitole,

 * this problem is not a bug, please don't post it as such
 * this problem is inappropriate for the r-devel list, which is for
technical questions
and discussion about the workings of R, not for questions about specific
analyses
 * please read the posting guide (URL listed in every message posted),
provide
a reproducible example, and resubmit your question to r-help
 * hint: the third argument to aggregate needs to be a function, further
optional
arguments can be specified.  sd(x) is not a function.  sd is.

 sincerely
    Ben Bolker

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