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2010 Jun 09
1
counting across leves of factors
I have dataframe with 17factors variables (for example every factor have
3levels)
I have maybe 5000 observation.
And i need to do table where is in every raw 1 of possible combination of
this factors and the numbur how many time is this combination in my dataset.
I wrote one code, but this is very slow and dumb.
it looks like this:
i<-0
for(i1 in levels(hivdat$pohl)){
a<-subset(hivdat,hivdat$pohl==i1)
for(i2 in levels(a$vekF)){
b<-subset(a,a$vekF==i2)
for(i3 in levels(b$ekstF)){
c<-subset(b,b...