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Type I Error Probabilities and Power of the Rank and Parametric Ancova Procedures

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  • Samuel L. Seaman
  • James Algina
  • Stephen F. Olejnik

Abstract

Empirical type I error rates and the power of the parametric and rank transform ANCOVA were compared for situations involving conditional distributions that differed between groups in skew and/or scale. For the conditions investigated in the study, the parametric ANCOVA was typically the procedure of choice both as a test of equality of conditional means and as a test of equality of conditional distributions. For those conditions in which rank ANCOVA was the procedure of choice, the power advantages were usually quite small.

Suggested Citation

  • Samuel L. Seaman & James Algina & Stephen F. Olejnik, 1985. "Type I Error Probabilities and Power of the Rank and Parametric Ancova Procedures," Journal of Educational and Behavioral Statistics, , vol. 10(4), pages 345-367, December.
    • Handle: RePEc:sae:jedbes:v:10:y:1985:i:4:p:345-367
    DOI: 10.3102/10769986010004345
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    Keywords

    ANCOVA; rank ANCOVA;

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