Hi Cecilia,
Trying it your way there where three reasons for errors, I fixed them in the
following code:
means<-matrix(nrow=3,ncol=4)
counter.i <- 0
counter.j <- 0
for (i in levels(factor(data$industry)))
{
counter.i <- counter.i + 1
for (j in levels(factor(data$year)))
{
counter.j <- counter.j + 1
means[counter.i,counter.j]<- mean(data$X1 [data$industry == i & data$year
== j] ,na.rm=TRUE)
}
counter.j <- 0
}
means
Also consider ddply in the plyr package (although that's an over kill if
your only having two loops)
Or Jorge solution.
Cheers,
Tal G
On Sun, Jun 28, 2009 at 7:39 PM, Cecilia Carmo <cecilia.ca...@ua.pt> wrote:
> for ( i in unique(data$industry))
> for (j in data$year){means[i,j]<-mean(data$X1,na.rm=TRUE)}
>
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