Hello,
I know that it'll be quite easy to do what I want but somehow I am lost as I am
new to R. I want to get summary results arranged by groups. In detail
I'd like get the number (levels) of Species per Family like for this dataset:
SPEC <- factor(c("a","a","b","b","c","c","c","d","e","e","e","e"))
FAM <- factor(c("A","A","A","A","B","B","B","C","C","C","C","C"))
df <- data.frame(SPEC,FAM)
I tried tapply(SPEC, FAM, nlevels).. but it is not the result I am looking
for...
What is the easiest way to do that? Do I have to rearrange the dataset?
Best regards and Happy New Year!
Johannes
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