Handbook of Evidence-Based Psychodynamic Psychotherapy
Current Clinical Psychiatry, 2009, Part V, 367-377, DOI: 10.1007/978-1-59745-444-5_16

The Perils of p-Values: Why Tests of Statistical Significance Impede the Progress of Research
An Open Letter to Psychotherapy Researchers

John M. Kelley

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Abstract

Imagine that you conduct an experiment to determine whether a new form of psychotherapy is more effective than treatment as usual. You analyze the data and find them to be statistically significant with a p-value that is less than 5%. How accurately does the following paragraph describe your understanding of the meaning of these results?

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