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Compute the number of complete cases in a pairwise fashion for x (and y).
x
y
pair_n(x, y = NULL)
Matrix of pairwise sample sizes (number of complete cases).
a numeric vector, matrix or data frame.
NULL (default) or a vector, matrix or data frame with compatible dimensions to x. The default is equivalent to y = x (but more efficient).
NULL
y = x
pair_n(mtcars)
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