Prospective Statistical Power: Sample Size Recommendations for the Investigation of the Main Parapsychological Phenomena
9 Pages Posted: 27 Feb 2015 Last revised: 10 Aug 2015
Date Written: February 25, 2015
The aim of this paper is to offer a practical guideline for researchers investigating parapsychological phenomena to choose appropriate sample sizes to achieve a statistical power equal or above 0.80.
The availability of different meta-analyses related to different parapsychological phenomena, allow a sufficient estimation of the expected effect sizes, that usually range from small to very small.
With these measures, it is possible to estimate the numerosity of sample sizes necessary to achieve a level of statistical power that can facilitate the replication of different parapsychological phenomena.
I discuss ways to deal with the investigation of phenomena with very small effect sizes requiring very large sample sizes.
Keywords: statistical power, sample size, replication, extrasensory perception, interaction at distance, effect size
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