Re: st: interpreting an output from -nl-

[Steven Samuels <sjsamuels@gmail.com>]

You are correct, Paul.

Steve
sjsamuels@gmail.com

On Mar 16, 2011, at 8:45 AM, Visintainer, Paul wrote:

In the presentation about finding a cutpoint for piecewise regression, ATS at UCLA presents this fine explanation: 

http://www.ats.ucla.edu/stat/stata/faq/nl_optimal_knots.htm

My question pertains to the estimate of the cutpoint, given as /c, in the  
-nl- output.  The value is 8.9876 with a 95% confidence interval of (8.11987, 9.855359).  This appears to be a confidence interval for the cutpoint, an x-value (i.e., the CI for the estimate of x at a specific point on y - the inflection).  Am I correct in this interpretation?

Thanks,

-p


________________________________________________
Paul F. Visintainer, PhD
Baystate Medical Center
Springfield, MA 01199

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