Type I Error Rates Of Four Methods For Analyzing Data Collected In A Groups vs Individuals Design

Stephanie Wehry, James Algina
2003 Journal of Modern Applied Statistical Methods  
Using previous work on the Behrens-Fisher problem, two approximate degrees of freedom tests, that can be used when one treatment is individually administered and one is administered to groups, were developed. Type I error rates are presented for these tests, an additional approximate degrees of freedom test developed by Myers, Dicecco, and Lorch (1981) , and a mixed model test. The results indicate that the test that best controls the Type I error rate depends on the number of groups in the
more » ... f groups in the group-administered treatment. The mixed model test should be avoided.
doi:10.22237/jmasm/1067645580 fatcat:6m7nc32tyjcq3ampgnug56mmli