dear R users, I am pleased to announce that segmented 2.1-0 is now available on CRAN. segmented focuses on estimation of breakpoints/changepoints of segmented, i.e. piecewise linear, relationships in (generalized) linear models. Starting with version 2.0-0, it is also possible to model stepmented, i.e. piecewise constant, effects. In the last release both models may be fitted via a formula interface, such as segreg(y ~ seg(x1, npsi=2) + seg(x2) + z) stepreg(y ~ seg(x1, npsi=2) + seg(x2) +seg(x3, npsi=3) + z, family=poisson) There is virtually no limit in the number of covariates and corresponding number of changepoints to be estimated. thank you, kind regards, Vito -- ================================================Vito M.R. Muggeo, PhD Professor of Statistics Dip.to Sc Econom, Az e Statistiche Universit? di Palermo viale delle Scienze, edificio 13 90128 Palermo - ITALY tel: 091 23895240; fax: 091 485726 http://www.unipa.it/persone/docenti/m/vito.muggeo Assoc Editor: Statist Modelling, Statist Meth Appl past chair, Statistical Modelling Society coordinator, PhD Program in Econ, Businss, Statist