Campbell's threats of quasi Flashcards
1
Q
History
A
Events occuring concurrently with cause (at time of the experiment)
2
Q
Maturation
A
Naturally occuring change
3
Q
Selection
A
Systematic differences between groups
4
Q
Attrition
A
Loss of respondents. Eg most accomplished drop out
5
Q
Instrumentation
A
Nature of the measure can change
6
Q
Testing
A
Exposure to tests can effect score of later test
7
Q
Regression to the mean
A
Selecting extreme causes that regress.
8
Q
Use of these in explaining effect
A
Possible other variables are endless, trying to identify the plausible and demonstrating with logic/data how they didn’t occur gives power to quasi exp.
