Robustness and power of analysis of covariance applied to ordinal scaled data as arising in randomized controlled trials.

@article{Sullivan2003RobustnessAP,
  title={Robustness and power of analysis of covariance applied to ordinal scaled data as arising in randomized controlled trials.},
  author={Lisa Sullivan and Ralph B. D'Agostino},
  journal={Statistics in medicine},
  year={2003},
  volume={22 8},
  pages={1317-34}
}
In clinical trials comparing two treatments, ordinal scales of three, four or five points are often used to assess severity, both prior to and after treatment. Analysis of covariance is an attractive technique, however, the data clearly violate the normality assumption and in the presence of small samples, and large sample theory may not apply. The robustness and power of various versions of parametric analysis of covariance applied to small samples of ordinal scaled data are investigated… CONTINUE READING
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