Regression and the Matching Fallacy in Quasi-Experimental Research
'ABSTRACT This self-cons ,.Pc'd end self-instructional unit is intended for use by evaluation aT:d acod'elopment personnel and. by studentt in introductory research ae.d evaluation courses. The unii. contains a discussion of the regression employing graphic illustrations with actual data. The uses: ic introduced to the regression.effect in the single group pretest-posttests design, after which he responds to mastery test instructional exercises. The second pa illustrates how the regression effect confounds the matched -'pair tyl)e of design and this, too, is followed by mastery test instructional exercises. The user should be familiar with the basic statistical concepts of mean, standard deviation, correlation, and z-scores. (Author/SE)