29nov2011 - CR Long C502 Biostatistical Thinking 29 Nov...

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CR Long C502: Biostatistical Thinking 29 Nov 2011 1 Learning Objectives 1. To recognize types of variables 2. To be familiar with terminology related to statistical inference Terminology Data The values, descriptions, or measurements recorded for variables ( Note: datum = singular, data = plural; “Data are…” is the correct expression). Variable A measurement that can take on different values for each study unit. Types of Variables 1. Numerical Variable A variable that takes on numerical values. 1a. Continuous Variable A variable that takes on numerical values and is capable of assuming any value over a specified range. 1b. Discrete Variable A variable that takes on numerical values and can be expressed only in whole numbers, because fractions are not possible. 2. Categorical Variable 2a. Nominal Categorical Variable A variable that takes on nonnumerical values in which there IS NO inherent ordering among the values. Dichotomous Variable:

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29nov2011 - CR Long C502 Biostatistical Thinking 29 Nov...

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