By Alexander Basilevsky
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Extra info for Experimental Social Programs and Analytic Methods. An Evaluation of the U.S. Income Maintenance Projects
The picture changes somewhat from the classical experimental setup when one considers the guaranteed income experiments. finitepopulation, and these individuals are assigned to various treatment and control groups. Here the sample must be representative of the population, and assignment among treatments and controls carried out in such a manner (say, random assignment) as to obtain independence (orthogonality) between individuals and treatments. For example, care should be taken so the control group does not have higher preexperimental earnings.
A bias may exist in the use of earnings as a measure of response since experimental families learn more quickly than control families to report their income on a gross rather than net basis. There is some evidence to support this differential learning effect (Hollister, 1973, 1974). 12. The results described here are from the Summary Final Report of RIME. Assessment and criticism of the RIME findings may be found in J. Palmer and J. Pechman, editors (1979a,b). 13. The results described here are from Kehrer et ai (1979).
K as opposed to the variances of individual ßh i= 1,2, . . , k. The optimum design therefore depends only on the structure of the design matrix X and the constraints. This perhaps unexpected result implies that we need not bother with matrices P and Wand that optimality can be achieved in a more simple fashion. ,. To incorporate weights P and W in the model Conlisk and Watts employ the trace of WV(PTß) as the objective function. The objective function now depends on the diagonal elements of the matrix.
Experimental Social Programs and Analytic Methods. An Evaluation of the U.S. Income Maintenance Projects by Alexander Basilevsky