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Posts uit mei, 2015 tonen

p=.20, what now? Adventures of the Good Ship DataPoint

You’ve dutifully conducted a power analysis, defined your sample size, and conducted your experiment. Alas, p=.20. What now? Let’s find out. The Good Ship DataPoint* Perspectives on Psychological Science’s first registered replication project , RRR1, was targeted at verbal overshadowing, the phenomenon that describing a visual stimulus, in this case a human face, is detrimental to later recognition of this face compared to not describing the stimulus. A meta-analysis of   31 direct replications of the original finding provided evidence of verbal overshadowing. Subjects who described the suspect were 16% less likely to make a correct identification than subjects who performed a filler task. One of my students wanted to extend (or conceptually replicate) the verbal overshadowing effect for her master’s thesis by using different stimuli and a different distractor task. I’m not going to talk about the contents of the research here. I simply want to address the question that