For a multimethod measure, a researcher measures anxiety using a 0- to 10-point verbal scale, the Spielberger State-Trait Anxiety Inventory (0 to 40 points), and systolic blood pressure readings (80 to 300 points)
What are logical strategies for using these three pieces of information gathered from each subject? (Select all that apply.)
a. Add up all three numbers for a total score.
b. Rank all three measures as 1-high, 2-medium, and 3-low, and sum the result.
c. Determine the most accurate measurement and give it more weight than the others in a ranking.
d. Determine the most accurate measurement in the first few subjects and then use it exclusively.
e. Report the numbers individually without summing them.
ANS: B, D, E
Another effective means of diminishing systematic error is to use more than one measure of an attribute or a concept and to compare the measures. To make this comparison, researchers use a variety of data collection methods, such as scale, interview, and observation. Campbell and Fiske developed a technique of using more than one method to measure a concept, referred to as the multimethod-multitrait technique. Multimethod measurement strategies decrease systematic error by combining the values in some way to give a single observed score of anxiety for each subject. Sometimes, however, it may be difficult logically to justify combining scores from various measures.
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