Dear Statalist members,
I want to implement in Stata a two segmented (quadratic-quadratic) logistic model to test the existence and estimate the location of the changepoint in a (U-shaped) relationship: continuous covariate--dichotomic response, as it was described by Goetghebeur and Pocock :("detection and estimation of J-shaped risk-response relationships" JRSSA 1995; 158:107-121).
Are there routines in Stata to do this?. Any help or suggestion would be much appreciated.
Walter Valdivia.
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