Checklists and Examples for Registering Statistical Analyses

For well-designed confirmatory research, all analysis decisions that could affect the confirmatory results should be planned and registered prior to data collection. These decisions include: the specific statistical test for each confirmatory hypothesis, whether the test is one-sided or twosided, the criterion for acceptable evidence, any transformations or adjustments to the data, any criteria for excluding or deleting data, and any corrections for multiple analyses. If this information cannot be pre-specified, the research is exploratory rather than confirmatory.