POL 51 Lecture 5: POL 51 Lecture 5

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Political Science
POL 51
C H R I S T Ycahill

Measurement: How do we determine values of X and Y (and Z) ● Ex: How does attitude toward the environment affect vote choice? ● Measurement: systematic observation and representation by scores or numerals ● Operationalization: the process of defining concept to make it measurable in the form of variable ● The method of operationalization can be different but it's how you make your argument that allows you to select one method. ● Characteristics of good measurement: ○ Reliability: consistency or repeatability of a measure ex: weight scale ○ Validity: how accurately a measure represents the concept it is supposed to measure; ex: midterm exams or LSAT ■ Face validity: how well it appears to measure the concept ■ Content validity: how well it captures the essential elements and excludes unrelated elements ■ Construct validity: how well it agrees with related measures according to relevant theories ■ Leading questions reduce the validity of the matter ○ Precision: a measure’s level of refinement, exactness or specificity ex: age ● On a scale of 1-5, with 5 being extremely warm welcome to 1 being not welcome at all, how do you feel about undocumented immigrants entering and living in the country ● Sampling: both observational and experimental studies rely on samples ● Goal is to generalize our work to a larger population ○ Ex: the city of Davis ○ Studying whole population difficult ● Ran
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