Preregistration in Research

WHERE TO PREREGISTER AN UNREVIEWED PREREGISTRATION?

Public

• OSF: https://osf.io/

Private

• OSF: https://osf.io/ (timestamped)
• AsPredicted: https://aspredicted.org (timestamped)
• figshare: https://figshare.com/ (timestamped)
• Clinical Studies/Trials: https://clinicaltrials.gov/ct2/home

WHAT SHOULD BE PREREGISTERED?

Hypotheses

• Describe Hypotheses (Relationship between Variables)
• If applicable - Describe expected shape of Interactions
• If applicable - Describe predictions for manipulation check, i.e. criteria for success of manipulation

Method

Design

• Independent variables, all their levels (Within- or Between participants? / Relationship between variables?)
• Dependent Variables
• Third Variables = Covariates or Moderators

Planned Sample

• Pre-selelction rule (if applicable)
• Where, from whom and how is data collected
• Sample Size (a priori power analysis or Baysian design analysis)
• Data collection termination rule

Exluscion Criteria

• Describe anticipated exclusion criteria (e.g. missing, erroneous, overly consistent responses, failing check-tests; demographic exclusions; Data-based outlier; method-based outlier)

Analysis Plan: Confirmatory

• Specify contingencies & assumptions
• Method of correction for multiple tests
• Method of missing data handling
• Reliability criteria for item inclusion in scale
• Anticipated data transformation
• Assumptions of Analyses, plans for alternative/corrected analyses if each assumption is violated

Analysis Plan: Exploratory

• "We do not have specific a-priori hypotheses"

TEMPLATES/RECIPES

• Templates can be found here: https://osf.io/k5wns/
• or here: van't Veer, A. E., & Giner-Sorolla, R. (2016). Pre-registration in social psychology—A discussion and suggested template. Journal of Experimental Social Psychology
• see also: Data Colada [post 64] How to properly preregister a study