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Description: In psychology and language research, attempts to replicate published findings are less successful than expected. For properly powered studies replication rate should be around 80%. The Open Science Collaboration (2015) could only replicate 36% of studies that were selected from different areas of psychology. This can partly be explained by publication bias and fraud, but most likely reflects a lack of power in the original studies. We describe how you can estimate the power of studies with both subjects and items as random factors.