Re: [R] Johnson-Neyman procedure (ANCOVA)

2009-10-31 Thread Chuck Cleland 
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.

http://www.comm.ohio-state.edu/ahayes/SPSS%20programs/modprobe.htm

 Thanks in advance.
 
 best,
 
 Steve

-- 
Chuck Cleland, Ph.D.
NDRI, Inc. (www.ndri.org)
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New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
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[R] Johnson-Neyman procedure (ANCOVA)

2009-10-30 Thread Stropharia 

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
-- 
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