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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