Re: [R] Calculating Summaries for each level of a Categorical variable

From: RaoulD <raoul.t.dsouza_at_gmail.com>
Date: Sat, 26 Jun 2010 21:46:40 -0700 (PDT)

Hi Corey,

Thanks so much for this. However, I get this error for tapply - "Error in tapply(RT, RT$R, fun=WA):
  arguments must have same length". Any idea how to get around this?

Thanks again,
Raoul

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