SWPERMUTE: Stata module to compute Permutation tests for Stepped-Wedge Cluster-Randomised Trials

Thompson, J. 2019. SWPERMUTE: Stata module to compute Permutation tests for Stepped-Wedge Cluster-Randomised Trials. [Online]. Statistical Software Components S458426, Boston College Department of Economics. Available from: https://ideas.repec.org/c/boc/bocode/s458426.html

Thompson, J. SWPERMUTE: Stata module to compute Permutation tests for Stepped-Wedge Cluster-Randomised Trials [Internet]. Statistical Software Components S458426; 2019. Available from: https://ideas.repec.org/c/boc/bocode/s458426.html

Thompson, J (2019). SWPERMUTE: Stata module to compute Permutation tests for Stepped-Wedge Cluster-Randomised Trials. [Data Collection]. Statistical Software Components S458426, Boston College Department of Economics. https://ideas.repec.org/c/boc/bocode/s458426.html

Description

Permutation tests are useful in stepped-wedge trials to provide robust statistical tests of intervention-effect estimates. However, the Stata command permute does not produce valid tests in this setting because individual observations are not exchangeable. We introduce the swpermute command that permutes clusters to sequences to maintain exchangeability. The command provides additional functionality to aid users in performing analyses of stepped-wedge trials. In particular, we include the option “withinperiod" that performs the specified analysis separately in each period of the study and the resulting period-specific intervention-effect estimates are combined as a weighted average.