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tp4648857
2012 Nov 14
3
numbering observations: help please!
...# for each person
my.data$item.number <- 0
for (i in 1:length(unique(my.data$person))) {
my.data$item.number [which (my.data$person == unique(my.data$person)[i])]
<- seq (1:dim(tmp)[1]) }
--
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