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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You can’t ignore gene-environment correlations when looking for gene-environment interactions

Humans love interactions, they tell interesting stories (however, no study has investigated this bias, AFAIK). However, statistics and nature hate interactions. Interactions in general have low prior, and because people fail to realize this properly, reports of interactions generally fail to replicate. This is also true for gene-environment interactions (GxE), the love-child of any would…

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