Abstract
The SIPP has proven extremely useful for the study of program participation and has permitted the analysis of participation issues that cannot be addressed with the CPS or with the available U.S. panels. The usefulness of SIPP lies more in its cross-sectional dimension, where that dimension is defined to include the extended length that permits measurement of participation activity over multiple months of calendar time, than in its panel dimension. The potential of SIPP for the analysis of program participation has scarcely been tapped thus far. The most severe constraint on this potential is the small size of the SIPP sample, a constraint whose relaxation deserves the highest priority.
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