[問題] sas異質變異檢定出現error
我要檢定model是否有異質變異的問題
於是到google找了一個指令,我照做了
指令檔如下
PROC REG data=P81P1.p81end354147new;
MODEL lnperwage=north college traincost big mid license boss DS firmyear
ratio3 ratio2 CAPE totsize merge share femaleratio edu year third second
revtotal1 revtotal2/spec;
TITLE ’White Test of Heteroskedasticity’;
QUIT;
但sas出現
WARNING: The average covariance matrix for the SPEC test has been deemed
singular which violates an assumption of the
test. Use caution when interpreting the results of the test.
我不了解哪個地方出問題
因為我也只是照著做而已
感謝版友的解答 謝謝
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