what is the wilson t-test for the null hypothesis what would be the difference between a joint model and an interaction term? which type of interaction term is rejected by the wald test? what test to use for a group comparison when do you test for gender dummies in a joint model if the wilson test is negative, what would the test do? what is the purpose of the wilhelm test on the interaction term for the male regression? why would you have to use a wilson test to reject a null hypothesis if gender dummy is positive, can the interaction term be rejected? if the group difference is insignificant then what would be the result of the interaction term why are the two regression tests used in a group comparison? what's the difference between an interaction term and a group effect? which is true for interaction terms how to test group difference in a joint model with interaction terms how can you test for group change in a joint model what tests do they use to find group differences what is an interaction term used for in a joint model how to do a joint model in an interaction term how to detect differences in two groups in a t-test what is the purpose of the wald test