ERIC Number: ED246058
Record Type: RIE
Publication Date: 1984-Apr-24
Reference Count: 0
The Effect of Alternative Definitions of Growth on Group Differences in Achievement.
Carroll, C. Dennis
This paper compares five growth measures using the High School and Beyond database. The measures are: (1) simple gain (posttest minus pretest); (2) difference between group means; (3) percentage of students who scored higher on the posttest than the pretest; (4) percentage of items missed on the pretest which are subsequently answered correctly on the posttest; and (5) difference between the observed posttest scores and the predicted posttest scores based on the correlation between the pre- and posttest scores. These methods were evaluated by determining how consistent each is in differentiating between groups which, on the basis of other evidence, are almost certain to differ in a specified direction. The groups considered were based on sex, race/ethnicity, socioeconomic status, and ability level. Problems were found with all five measures of growth. It is recommended that researchers use multiple measures to study growth. If that is not possible, the percentage initially wrong but subsequently correct measure or the regression residual should be used. (BW)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers: Gain Scores; High School and Beyond (NCES)
Note: Paper presented at the Annual Meeting of the American Educational Research Association (68th, New Orleans, LA, April 23-27, 1984).