notes1 - Variable is a characteristic of an individual...

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Variable is a characteristic of an individual. Qualitative or Categorical : places an individual into one of several groups or categories (finitely many possible) Quantitative : measurements represent quantities, “how many” (infinite possibile) Scales of Measurement: Ratio variable o Quantitative scale (almost all) o Ratios meaningful, inherently defined zero (salary, weight, distance) Interval variable o Quantitative scale (very few) o Ratios not meaningful, no inherently defined zero (e.g., temperature ) Ordinal variable o Qualitative (Categorical) scale o Meaningful ordering or ranking of categories (e.g., class) Nominative variable o Qualitative (Categorical) scale o No meaningful ordering or ranking of categories (e.g., gender, color) Qualitative (Categorical variables ): The values are the labels for the categories. The distribution is described by either the count or the percent who fall in each category.
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