作者hanjing (心宽念纯)
站内Statistics
标题[问题] sas异质变异检定出现error
时间Wed Apr 22 23:22:27 2009
我要检定model是否有异质变异的问题
於是到google找了一个指令,我照做了
指令档如下
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出现
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.
我不了解哪个地方出问题
因为我也只是照着做而已
感谢版友的解答 谢谢
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