was observed for lots of traits. Galton was deeply concerned about “regression to mediocrity.” 2 Types of Data Typically, data come to us in one of four forms: Categorical (Nominal) Ordinal Interval Ratio 3 Categorical variables Take on several levels, none of which have any natural ordering Sex (M, F, …) Race (Black, White, Asian, …) Program major (Stat, CS, Math, Psych, Bio, …) Type of fertilizer (A, B, …) Drug (Active, Placebo) When controlled by the experimenter…
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