npANCOVA: Nonparametric ANCOVA Methods
Nonparametric methods for analysis of covariance (ANCOVA) are
distribution-free and provide a flexible statistical framework for
situations where the assumptions of parametric ANCOVA are violated
or when the response variable is ordinal. This package implements
several well-known nonparametric ANCOVA procedures, including Quade,
Puri and Sen, McSweeney and Porter, Burnett and Barr, Hettmansperger
and McKean, Shirley, and Puri-Sen-Harwell-Serlin. The package provides
user-friendly functions to apply these methods in practice.
These methods are described in Olejnik et al. (1985)
<doi:10.1177/0193841X8500900104> and Harwell et al. (1988)
<doi:10.1037/0033-2909.104.2.268>.
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