# Tag Info

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There is a very large literature on this, and it features many subtle points, but I will try to summarize some general themes. In general, subjects are very consistent at ranking pictures of others for attractiveness (thus, eliminating the popular notion of "beauty is in the eye of the beholder"). For instance Cunnigham et al. (1995) found a correlation of ...

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General thoughts on factors influencing test-retest correlations From a theoretical perspective, it makes sense that groups that experience temporary states that lower state intelligence or lead to a poorer test taking orientation would have lower test-retest cognitive test correlations. By lower state intelligence, I'm referring to states of being such as ...

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Harvill mentions an estimate by Lord (1959). Lord (1959) presents some data for the standard error of measurement for some moderately difficult cognitive measures. While there are many caveats (e.g., the estimate of the standard error is most accurate for scores around 50% and the estimates are based on tests that are neither particularly easy or ...

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'Precision' in classical test theory Most accounts of classical test theory do not have a notion of precision as such, but occasionally, reliability may be called precision instead. The relationship is probably most concisely illustrated with the standard dartboards. This is also explained on the Wikipedia Item Response Theory page, but as you can see, in ...

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To me the most natural solution is to just use item response theory (IRT). IRT has been around for a few decades, so it is well established, implemented in a variety of software packages and provides a sensible, extensible framework for this type of problem. Essentially, one assumes an underlying latent construct of interest, values of which should drive ...

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Bacon and Bean (2006) discuss the issue of the reliability and validity of GPA. They report the results of two studies that looked at the reliability of GPA in samples of business students at the same university. Average intercourse grade correlations were typically between $\bar{r} =.18$ and $\bar{r} =.38$. Estimates of reliability for GPA ranged from .67 ...

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