there are three basic situations for paired data: 1) repeated measures, that is, repeated obseevations on the same subjects over time; the pretest posttes design is one example of this and longitudinal studies; 2) matched data as in Karen's Case-Control designs in health sciences data; 3) paired data such as sibling pairs, husband-wife pairs, etc, where the subjects are naturally paired in that they may be more similar to each other than to other people, but not matched by the researcher. Of course, you can have combinations of these situations.
Paul R. Swank, Ph.D. Professor, Developmental Pediatrics Medical School UT Health Science Center at Houston . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
