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GGR 270 – Lecture 2 – September 22, 2010
Variables and Data
oCharacteristic of the population that changes or varies over time
oExamples include temperature, income, education, etc...
oObserve and measure variables
oTwo key categories
•Discrete or continuous
oResults from measuring variables – set of measurements
oDifferent categories: Univariate, Bivariate, Multivariate
Variables – Scales of Measurement I
Scale defines amount of information a variable contains and what statistical
techniques can be used