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Scale construction - Coggle Diagram
Scale construction
three strategies for scale construction
external (empirical evidence)
intuitive (clinicians opinion)
internal (factor analysis)
HOI-R
constructed using a combination of all three strategies
questionnaire, aim: identify military personnel at the risk of early discharge
construction of new predictor scales from items of the HOI-R using the three different approaches
aims
compare validity of three strategies
comparing performance for weighting predictors
relationship between content validity and predictive validity
results
differential predictive validity: external > internal > intuitive
six stages of test construction
constructing the items
testing the items
item-difficulty index (P)
item-reliability index
item-validity index
item-characteristics curve
item-discrimination index
selecting a scaling method
expert rankings
method of equal-appearing intervals ?
method of absolute scaling
Likert scales
Guttman scales
method of empirical keying
rational scale construction (internal consistency)
revising the test
cross validation
defining the test
publishing the test