Hi.
Try compute the correlation for the transposed data frame:
cor( t(person.data), use="pairwise.complete.obs" )
Assuming that your data frame "person.data" contains NAs to indicate
where no value is available, I think the following computation yields N:
(!is.na(person.data)) %*% t(!is.na(person.data))
using the functions "is.na", "!" (negation), "%*%" (matrix
multiplication) and "t" (matrix transpose). For details see their help
pages.
Christian
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