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steoan221a
rm2.6_measurement1.pptxChapter 6: Measurement Chapter Overview
Measurement in Research
Understanding the Basics of Measurement
Levels of Measurement
Determining the Level of Measurement
Issues of Measurement Error
Assessing Measurement Reliability and Validity
Chapter Learning Objectives
Understand the basic issues of measurement in social science research
Understand the core concept of levels of measurement
Learn to determine the appropriate level of measurement for a variable
Understand and identify the nature and sources of measurement error
Understanding the Basics of Measurement
Operationalization
Translating a concept of interest into a form that can be measured
Types of Variables
Qualitative vs. Quantitative measures
Dependent vs. Independent variables
Levels of Measurement
Nominal Variables
Race/ethnicity, colors
Ordinal Variables
Agree / disagree scales, ranked orders, variables with discrete categories
Interval (ratio) Variables
Temperature, age, income, any continuous variable
Determining the Level of Measurement
Challenges in recognizing which is the actual level of measurement for a given variable
Challenges in knowing which is the appropriate level of measurement to use for a variable in a given research situation
Issues of Measurement Error
Sources of measurement error:
Systematic measurement error: occurs when factors create error in the measuring process itself or errors influencing the concept being measured
Random measurement error: an error that is not directly related to the process of measuring a concept
Assessing Measurement Reliability and Validity
Validity assessment approach
Face validity
Content validity
Reliability assessment approach
Test—Retest
Intercoder checks
