5 pts.
 How to compute ddfm=containment
It is not clear to me how the ddfm of containment (defalt of ddfm) is computed. The SAS manual said it's computed by "n-rank(XZ)". However, the matrix multiplication is not valid most of the time.

Software/Hardware used:
ASKED: March 16, 2009  6:35 PM
UPDATED: March 16, 2009  6:48 PM

Answer Wiki:
Last Wiki Answer Submitted:  Be the first to answer this question.
All Answer Wiki Contributors:  Be the first to answer this question.
To see all answers submitted to the Answer Wiki: View Answer History.


Discuss This Question:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _