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Experimental and Quasi-Experimental Designs for Research
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Experimental and Quasi-Experimental Designs for Research
DONALD T. CAMPBELL
Northwestern University
JULIAN C. STANLEY
Johns Hopkins University
In this chapter we shall examine the validity of 16 experimental designs against 12 common threats to valid inference. By experiment we refer to that portion of research in which variables are manipulated and their effects upon other variables observed. It is well to distinguish the particular role of this chapter. It is not a chapter on experimental desi...
DONALD T. CAMPBELL
Northwestern University
JULIAN C. STANLEY
Johns Hopkins University
In this chapter we shall examine the validity of 16 experimental designs against 12 common threats to valid inference. By experiment we refer to that portion of research in which variables are manipulated and their effects upon other variables observed. It is well to distinguish the particular role of this chapter. It is not a chapter on experimental desi...