Covering array issue: not expected analysis output
Hi, I ran a covering array with t2. there are totally 27 runs with 15 factors. success runs = 3, failure runs = 241)the output only show main effect and its level that causes fails, but no 2-factor-interaction.Why with t2 in this case , only the main effects reported? 2) there are couple of known combination that will cause fail were design into the test, but the analysis didn't show those factor...