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Comments, Conjectures and Conclusions

机译:评论,猜想和结论

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摘要

The tetrachoric correlation is a product-moment correlation between two bivariate normal variables that each have been measured on a dichotomous scale. For instance, a quantitative genotype might be expressed as a dichotomous phenotype; amount of knowledge of a specific topic might be measured by a test item that is scored correct/incorrect; or a survey question that is of a sensitive nature (e.g. income, alcohol consumption, body weight, etc.) might ask the respondent to simply check one of two categories (e.g. less than $40,000, at least $40,000). The underlying quantitative variable can be latent (unobservable), such as genotype or knowledge, and observable only on a dichotomous scale. Alternatively, the underlying quantitative variable can be observable, such as income, and measured on a dichotomous scale for convenience or other reasons.
机译:四项相关是两个二元正态变量之间的乘积-矩相关,每个二元正态变量已按二分法规模进行了测量。例如,定量基因型可以表示为二分表型。特定主题的知识量可能由得分为正确/不正确的测试项目来衡量;或具有敏感性质的调查问题(例如收入,饮酒量,体重等),可能会要求受访者简单地检查以下两个类别之一(例如,少于40,000美元,至少40,000美元)。潜在的定量变量可以是潜在的(不可观察到的),例如基因型或知识,并且只能在二分尺度上观察到。备选地,潜在的定量变量可以是可观察的,例如收入,并且出于方便或其他原因而在二分尺度上进行测量。

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