STAT101_Chap2 - 2 Sampling and Measurement Variable a...

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2. Sampling and Measurement Variable – a characteristic that can vary in value among subjects in a sample or a population. Types of variables Categorical (also called qualitative ) Quantitative
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Categorical variable – scale for measurement is a set of categories Examples :
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Quantitative variable – possible values differ in magnitude Examples:
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Scales of measurement For categorical variables, two types: Nominal scale – unordered categories Ordinal scale – ordered categories
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For quantitative variables, set of possible values called an interval scale . (i.e., numerical interval between each possible pair of values) Note: In practice, ordinal categorical variables often treated as interval by assigning scores (e.g., Grades A,B,C,D,E an ordinal scale, but treated as interval if assign scores 4,3,2,1,0 to construct a GPA) Ordering of variable types from highest to lowest level of differentiation among levels: interval > ordinal > nominal
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Another classification: Discrete/Continuous Discrete variable – possible values a set of separate numbers, such as 0, 1, 2, … Example : Number of …
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