How to use χ2 test correctly——the Wald΄s test and the implementation of SAS software / 四川精神卫生

The purpose of this article was to introduce the Wald΄s test and the SAS implementation. The specific contents involved the following nine aspects， namely the general Wald΄s test，the robust Wald΄s test，the constrained Wald΄s χ2 test，the generalized Wald΄s test，the generalized Wald΄s log-linear test，the Wald΄s F test，the Wald΄s adjusted F test，the Wald΄s log-linear F test and the adjusted Wald΄s log-linear F test. The paper used two examples and the SAS software to achieve most of the Wald΄s tests mentioned above.