[R] Johnson-Neyman procedure (ANCOVA)

Chuck Cleland ccleland at optonline.net
Sat Oct 31 18:38:10 CET 2009

On 10/30/2009 9:20 PM, Stropharia wrote:
> Dear R users,
> Does anyone know of a package that implements the Johnson-Neyman procedure -
> for testing differences among groups when the regression slopes are
> heterogeneous (in an ANCOVA model)? I did not get any matches for functions
> when searching using R Site Search.
> If it has not been implemented in R, does anyone know of another statistical
> package that has this procedure? I found very old scripts available for
> Mathematica, but have had difficulty getting them to work.


> Thanks in advance.
> best,
> Steve

Chuck Cleland, Ph.D.
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