Table 1.

Template questions for the preregistration of analyses of preexisting data.

Question		Description
1.	What is the hypothesis that will be investigated?	Provide a brief description of the relevant theory and formulize the hypothesis as precisely as possible.
2.	How will the crucial variables be operationalized?	State exactly how the variables specified in the hypothesis will be measured.
3.	What is the source of the data included in the analyses?	Specify the source of the obtained data. Also provide information about the context of the data source and clarify whether the data has been previously published. In case of simulated data, provide information on how the data was generated.
4.	How will this data be obtained?	Specify how the data will be requested or accessed. Clarify whether the data were already available and whether the dataset has been previously explored or analyzed.
5.	Are there any exclusion criteria for the data?	Specify whether there were any criteria for the exclusions of certain datasets, observations or time points.
6.	What are the planned statistical analyses?	Specify the statistical model that will be used to analyze the data and describe the data pre-processing steps. Be as specific as possible and avoid ambiguity.
7.	What are the criteria for confirming and disconfirming the hypotheses?	Specify exactly how the hypothesis will be evaluated. Give specific criteria relevant to the used analytical model and framework (e.g., alpha-values, Bayes Factor, RMSEA).
8.	Have the analyses been validated on a subset of the data? If yes, please specify and provide the relevant files.	Indicate whether the proposed data-analyses have previously been validated on a subset of the data or a simulated dataset. If so, provide the data files and data syntax.
9.	What is known about the data that could be relevant for the tested hypotheses?	Please describe any prior knowledge that you have about the data set (e.g., the known mean of a variable) that is relevant for your research question.
10.	Please provide a brief timeline for the different steps in the preregistration.	Provide the (foreseen) dates for the different steps in this preregistration form.