Colleagues,

I am working on a problem at the edge of my knowledge of statistics.

Basically, I have values for two groups - I am trying to calculate the  
90% confidence limits for the difference between means.  I can  
implement this without difficulty based on standard equations that are  
available in stat textbooks: (difference between means) / (pooled  
standard error)

My problem arises when I try to correct for the value of a covariate.   
I can do the ANOVA with the covariate as a factor.  But, I don't know  
how to use the output to obtain the confidence limits of the difference.

I suspect that several participants in this board have implemented  
code to so this.  I hope that someone is willing to share the code.

Thanks in advance.

Dennis


Dennis Fisher MD
P < (The "P Less Than" Company)
Phone: 1-866-PLessThan (1-866-753-7784)
Fax: 1-415-564-2220
www.PLessThan.com


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