For example, the Shipley has a sample size of 263 for concurrent validity and I'm wondering if this is enough. Also, this is a stretch, but does anyone know the concurrent validity of the Figure reasoning test?
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Similar to: Are there rule of thumb regarding sample size when neuroscientific measurements are used?, Method and sample size to test validity and reliability of a scale/ survey, and What is a good rough rule of thumb regarding required sample size for questionnaire studies? – Arnon Weinberg Sep 05 '21 at 04:09