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

From: Greg Snow <Greg.Snow_at_imail.org>
Date: Mon, 28 Jun 2010 11:23:33 -0600

The problem is that tapply is expecting a vector for the first argument, your first argument is a list or data frame, so the length that it sees is the number of list elements (columns of the data frame). You need to either pass a single vector, or use functions like aggregate or the plyr package to work on all the columns in a data frame.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow_at_imail.org
801.408.8111



> -----Original Message-----
> From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-
> project.org] On Behalf Of RaoulD
> Sent: Saturday, June 26, 2010 10:47 PM
> To: r-help_at_r-project.org
> Subject: Re: [R] Calculating Summaries for each level of a Categorical
> variable
>
>
> 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
> --
> View this message in context:
> http://r.789695.n4.nabble.com/Calculating-Summaries-for-each-level-of-
> a-Categorical-variable-tp2269349p2269815.html
> Sent from the R help mailing list archive at Nabble.com.
>
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______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Received on Mon 28 Jun 2010 - 17:25:47 GMT

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