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Research Methods: Detailed Notes from Lecture SIX!!!

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PSYC 2030
Lisa Fiksenbaum

Lecture 6 February 13 2012Issues related to measurements and data analysis Chapter 4 Measurement Scales Nominal Ordinal Interval and Ratio NOIRNominal ScaleSimple assignment of categoriesDifferences between nominal categories are QUALITATIVE instead of QUANTITATIVEno numerical differenceEg males vs females introverts vs extrovert sports car vs SUVSummarizing and analyzing data is limitedDifferencesReport frequency in the form of proportion orof instances Ordinal ScaleInvolve rank orderingEg results in a horse rase o Class rank o Pop music chart standingCan determine whether 2 individuals are different and the direction of difference BUT no magnitudeInterval scaleInvolve rank ordering AND the distance between adjacent categories is assumed to be identicalEgo Temperaturethe distance between 40 degrees and 50 degrees is the same as the distance between 70 degrees and 80 degrees o Likert scales eg how would you rate the quality of Eugene winter weather2 1 0 1 2 o With Likert scales it is assumed that the distance between individual points on the scale is identicalAllow calculation of absolute distance between items as well as the calculation of average valuesDo not allow conclusions about the ratio of one value and another eg 30 degrees Fahrenheit is NOT three times as warm as 10 degrees FahrenheitRatio ScaleInvolve rank ordering with a constant difference between adjacent categories and there is an absolute zero point on the scale Exampleso Height distance reaction time number of responses made
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