p > .05 thus no effect thus familial confounding fallacies

Reading over some sibling control studies, BIG TOUGH GUY mentioned this quite wrong study: Meier, S. M., Mors, O., & Parner, E. (2017). Familial confounding of the association between maternal smoking during pregnancy and schizophrenia. American Journal of Psychiatry, 174(2), 187-187. The topic of the study need not interest us, the error is statistical. Results…

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Review: Psychological Testing: Theory and Practice (Colin Cooper)

Cooper, C. (2018). Psychological testing: theory and practice. Routledge. This is a pretty food good introduction to psychometrics (the science of psychological measurement). There is the now customary dislike for NHST, more focus on effect sizes, mostly equation-free presentation (except when needed). The table of contents gives a good idea of the conceptual space covered:…

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Self-teaching stats with R in 2020

See 2019 post on introductions to psychology etc. for broader coverage Anon asks me today: What would be the best way to quickly self-teach enough statistics to be able to evaluate academic papers? I have the basic concepts down but I’ve never taken an actual stats class. The glib reply is: l2code. For reals though. But…

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Data imputation in psychometric meta-analysis

Yep, it’s another comment based on reading too much industrial and organizational psychology! The Schmidt and Hunter approach to meta-analysis, AKA validity generalization theory (VG theory) AKA psychometric meta-analysis (PMA) differs from others in that it explicitly considers data artifacts and biases and tries to correct for them (good introduction paper here, and authors also…

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It works in practice, but does it work in (my) theory?

There’s a certain type of person that doesn’t produce any empirical contribution to “Reducing the heredity-environment uncertainty”. Instead, they contribute various theoretical arguments which they take to undermine the empirical data others give. Usually, these people have a background in philosophy or some other theoretical field. A recent example of this pattern is seen on…

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