Has anyone successfully used R package "segmented" ? I tried on my data and could not get the syntax right. In addition, I wonder whether it only operates with continuous variables as I deal with discrete variables. I was contacted by its author and, upon his request, I forwarded one of my files where the plot of amplitude versus time change slopes 4-5 times. Finding the breakpoints by visual inspection is a tedious error-prone task. So far I've been unable (and had no time to seriously think of) some sort of semi-automatic way of doing that. I was hoping that someone else has already addressed and solved this problem ... Regards, -- Maura E.M [[alternative HTML version deleted]]