Sociology 3306A/B Lecture Notes - Lecture 9: Statistical Inference, Standard Deviation, Level Of Measurement
6 Dec 2016
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Coding: assigning numbers to variable categories, simpli es data entry and analysis, close ended questions; few categories, for open ended questions - group them that re ects the full range of responses. Entering the data: data as a matrix, observations in rows and variables in columns, can use cade for paper and pencil questionnaire, optical scanner. Two cleaning techniques : 1) wild code checking any codes that are not legitimate, 2) consistency checking if responses to certain questions are related in reasonable ways to responses to particular questions. Include in the analysis: collapse categories - should still be done with theoretical criteria; approximately equal proportion of cases in each category. Interval and ratio scale variables: some variables like age and income, too many values, can use measures of central tendency, mean . Thursday, november 17, 2016: median , mode .
