Le 15/04/2018 à 17:56, alireza daneshvar a écrit : > break-down point Can you explain more what you plan to do and give an example of what you have tried to do until now to do a "break down point" in R. Perhaps a "break down point" is common in your field, but I have no idea about what it is ! https://en.wikipedia.org/wiki/Breakdown_(1997_film) Sincerely Marc