Type I error
Definition: “Incorrect rejection of a null hypothesis” (Simmons et al., 2011, p. 1359), i.e. finding evidence to reject the null hypothesis that there is no effect when the evidence is actually in favouring of retaining the null that there is no effect (For example, a judge imprisoning an innocent person). Concluding that there is a significant effect and rejecting the null hypothesis when your findings actually occurred by chance.
Related terms: Frequentist statistics, Null Hypothesis Significance Testing (NHST), Null Result, *P* value, Questionable Research Practices or Questionable Reporting Practices (QRPs), Reproducibility crisis (aka Replicability or replication crisis), Scientific integrity, Statistical power, True positive result, Type II error
Reference:
- Simmons, J. P., Nelson, L. D., & Simonsohn, U. (2011). False-positive psychology: Undisclosed flexibility in data collection and analysis allows presenting anything as significant. Psychological Science, 22(11), 1359–1366. https://doi.org/10.1177/0956797611417632
Originally drafted by: Lisa Spitzer
Reviewed by: Mahmoud Elsherif, Adrien Fillon, Helena Hartmann, Matt Jaquiery, Mariella Paul, Charlotte R. Pennington, Graham Reid, Olly Robertson, Mirela Zaneva