On Fri, 7 Apr 2017, Sorkin, John wrote:

Is there an R package that will perform a piecewise continuous Poisson regression? I want to model two linear segments that intersect at a common knot.

The "segmented" package implements such broken stick regressions based on either "lm" or "glm" models. The latter include Poisson regression.

Thank you,
John

John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric 
Medicine
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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