[R] tabulate means & NA

Dr. Diego Kuonen kuonen at statoo.com
Thu Jun 20 11:32:30 CEST 2002

Christian Schulz wrote:
> i have some problems to get means, but the data have got
> NA's  which should not be replaced or delete !
> tapply(data,var,mean)     # makes me problem,because when one value is
> NA mean is NA,too.

You may want to have a look at the mean help page (?mean) and
add `na.rm = TRUE' to the `tapply' call, i.e.

  tapply(data, var, mean, na.rm=TRUE)

You might also want to read the help pages for `na.action', `na.omit', 
`na.fail' on how methods can be tuned to deal with missing values.


  Diego Kuonen

Dr. ès sc. Diego Kuonen        CEO & Applied Statistician 
Statoo Consulting, PO Box 107, 1015 Lausanne, Switzerland
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