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Usage:
distcomp(y), REAL matrix y with no MISSING values
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Keywords:
covariance, descriptive statistics
distcomp(y) computes the generalized distances of each row of REAL
matrix y from the mean of all the rows. y must not have any missing
elements.
When y is n by p, the result is the length nrows(y) vector
d = diag((y - ybar') ' %*% solve(s) %*% (y - ybar'),
where ybar is the vector of column means and s is the sample covariance
matrix of y. The individual elements of d[i] are
d[i] = (y[i,]' - ybar)' %*% solve(s) %*% (y[i,]' - ybar),
Very commonly matrix y is the matrix RESIDUALS computed by manova().
See also chiqqplot().
Gary Oehlert
2003-01-15