Dear all,
i would like to count the number of times where I have combined occurrences of
the categories of 2 variables.
For instance, in the dataframe below, i would like to know how many times each
author (au1, au2, au3 represent the first, second, third author) is associated
with each of the category of the variable 'nam'. The position of the author
does not matter.
nam <- c('da', 'ya', 'da', 'da', 'fr', 'fr', 'fr', 'da', 'ya', 'fr')
au1 <- c('deb', 'art', 'deb', 'seb', 'deb', 'deb', 'mar', 'mar', 'joy', 'joy')
au2 <- c('art', 'deb', 'mar', 'deb', 'joy', 'mar', 'art', 'lio', 'nem', 'mar')
au3 <- c('mar', 'lio', 'joy', 'mar', 'art', 'lio', 'nem', 'art', 'deb', 'tat')
tutu <- data.frame(cbind(nam, au1, au2, au3))
thanks,
David
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