The
first people recruited are assigned to one group and the rest go in another.
There
are two groups divided by a cut off score - one group's scores are above
that cut off, the other group's scores are below.
Validity and the Regression-Discontinuity (RD) Design
Quiz
2. The basic RD design is a pretest-posttest two group design with assignment to a group based on a cut off. What does this mean?
The
first people recruited are assigned to one group and the rest go in another.
There
are two groups divided by a cut off score - one group's scores are above
that cut off, the other group's scores are below.
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