Psy 232 Class notes outline: Experimental Designs Within Groups (Repeated-Measures)

 Scores for one group, tested in two or more conditions, are compared.

     Examples . . .. 

 Two major advantages of repeated measures design:

      1 - Primary advantage . . .

            a -

            b -

            c -       

            d -

    2.- Since # of scores can be high, . . .

 Because of the foregoing advantages, . . .

Several possible disadvantages in repeated measure design:

      1 - Time-related effects:

            History . . .

             Maturation . . .

              Statistical regression . . .

                          Especially a problem when . . .

      2 - Order effects:

            Carry-over effects . . .

            Progressive error . . .

Counterbalancing -

     Purpose - 

     Procedure: -

     Counterbalancing does not eliminate order effects, but . . .

             For experiments with a small # of treatments (2 or 3), . . .

             For experiments with a large # of treatments, . . .

                When complete counterbalancing is not practical, . . .

                          Latin squares designs . . . 

                          Random order designs . . .

Summary:  When possible, . . .

        a.

        b.

        c.

        d.