distcomp(y), REAL matrix y with no MISSING values |

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