we have an analogous situation here on HN. Karma ... People upmod because they agree, or because they think the post is interesting. This blends two quite different characteristics into one number.
False analogy. Karma-score blending is arithmetic. Latent factors of mental-ability tests (or latent-factors of anything) are derived non-arithmetically.
False analogy. Karma-score blending is arithmetic. Latent factors of mental-ability tests (or latent-factors of anything) are derived non-arithmetically.