Because they don’t have a control group, one group pre-post designs don’t protect against many alternative explanations for differences in the dependent variable other than changes in the independent variable. This is a problem of :
Internal validity
External validity
Construct validity
Test-retest reliability
Inter-rater reliability
Greg, noted cat lover, has developed the Fancy Cat Rating Inventory. As a way of determining if all his judges are judging his cats with the same standards, he would look at:
Inter-rater reliability.
Split half reliability.
Test-retest reliability.
External validity.
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Because they don’t have a control group, one group pre-post designs don’t protect against many alternative...