11.   Because the Price study is based on past performance, it cannot be considered a definitive guide to future investment strategy.

12.   Both the Johns Hopkins and Yale researchers based their studies on information from the federal Medicare health insurance program, but analyzed it by different methods.

13.   A precise number of saved lives is uncertain, because the study is based on statistical modeling that depends on certain assumptions.

14.   But the human studies were usually based on a small number of subjects and the abortion-breast cancer link was often a peripheral finding of the research.

15.   Foster replied that the study was based on a small sample and that a broader study was needed.

16.   Greifinger based his study on projections from several state studies.

17.   However, the WWF study was based on computer models that produce best-guess possibilities based on an imperfect knowledge of climate dynamics.

18.   In all likelihood, he learned a lot on his own, basing his studies on English models of the time.

19.   Price based its study on the performance of growth mutual funds surveyed by Morningstar Inc.

20.   Previous studies were based on a nationwide surveys and are considered less reliable because the sample size of some groups were so small.