[EMAIL PROTECTED] wrote:
List,
I am trying to extract summary statistics from a data frame with several
variables (and NAs) into a dataframe with the columns: Variablename (ie the
colnames of original data), mean, stdev, max, min, Valid N, Missing Values.
Extracting the statistics is straightforward using stack and aggregate.
However, I haven't succeeded in obtaining the number of Missing Values. I
can extract these from describe (Hmisc library), but surely there is a
simpler way similar to obtaining the mean using aggregate?
The similar way is:
aggregate(......., function(x) sum(is.na(x)))
Uwe Ligges
Suggestions are much appreciated
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