* What variables are present in each of the major national data bases?
* What are the problems and dangers in making comparisons across data bases?
* What factors invalidate comparisons of test scores across data bases?
* In what ways can data from certain data bases be physically merged with data from other data bases?
This text clearly demonstrates what can be done with large national data bases and, perhaps equally important, what cannot be done -- or done only if certain precautions are taken.
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