Piece-wise continuous regression with one knot

Windows Vista
R 2.10 - I know it is old, I will update later today.

How might I perform a piece-wise linear regression where two linear 
segments are separated by a single knot? In addition to estimating the 
slopes of the two segments (or the slope in one segment and the 
difference between the slope of the first and second segment), I would 
like the analysis to select the optimum knot. My first analysis will 
contain a single dependent and a single independent variables. 
Subsequent analyses will add additional independent variables to 
determine the effect on the results of adjusting for potential 
confounding.

Thank you,
John


John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)

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