Experimental and Quasi-Experimental Designs for Research

by Donald T. Campbell & Julian C. Stanley

Publisher: Ravenio Books

Publication Date: September 29, 2017

ISBN: 1230001942538

Binding: Kobo eBook

Availability: eBook

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Experimental and Quasi-Experimental Designs for Research

Northwestern University

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 design in the Fisher (1925, 1935) tradition, in which an experimenter having complete mastery can schedule treatments and measurements for optimal statistical efficiency, with complexity of design emerging only from that goal of efficiency. Insofar as the designs discussed in the present chapter become complex, it is because of the intransigency of the environment: because, that is, of the experimenter’s lack of complete control.