Try this:
subset(as.data.frame(xtabs( ~ city + var, df)), !Freq)
On Wed, Feb 2, 2011 at 1:49 PM, H Roark wrote:
>
> I have a data set covering a large number of cities with values for
> characteristics such as land area, population, and employment. The problem I
> have is that some cities lack
H Roark wrote:
I have a data set covering a large number of cities with values for
characteristics such as land area, population, and employment. The problem I
have is that some cities lack observations for some of the characteristics and
I'd like a quick way to determine which cities have m
I have a data set covering a large number of cities with values for
characteristics such as land area, population, and employment. The problem I
have is that some cities lack observations for some of the characteristics and
I'd like a quick way to determine which cities have missing data. For
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