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Detect if a one- or two-sample problem is specified
is_two_sample(Y, q)
TRUE for a two-sample problem (i.e., Y non-null and q = NULL) and FALSE for a one-sample problem (i.e., Y = NULL and q non-null).
TRUE
Y
q = NULL
FALSE
Y = NULL
q
A vector, matrix, data frame or NULL
NULL
A function or NULL.