The SURVEYREG Procedure

X’X Matrix

If you specify the XPX option in the MODEL statement, PROC SURVEYREG displays the $\mb {X’X}$ matrix. When there is a WEIGHT variable, the procedure displays the $\mb {X’WX}$ matrix. This option also displays the crossproducts vector $\mb {X’y}$ or $\mb {X’Wy}$ , where $\mb {y}$ is the response vector (dependent variable).

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