Hi, I've set up a discrete choice experiment on magazine preference following the guidelines from Azaiki. H & Nishimura K. "Design and Analysis of Choice Experiments Using R. A Brief Introuction" from Agricultural Informatin Research 17(2), 2008. 86-94. I'm working with the clogit() function from the survival package. I've set up the data like this: Person Id / Choice Set / Stated Preference ... (the dots being magazine characteristics with price, print quality etc) 1 1 0 ... 1 2 0 ... 1 3 1 ... 2 1 0 ... 2 2 1 ... 2 3 0 ... 3 1 1 ... 3 2 0 ... 3 3 0 ... ... ... The clogit() gives me coefficients etc. However, the literature states that one can model change in, say, price. Answering questions like "How many will read magazine 2 when price falls with $2"?. Can someone please outline a simple example on how to calculate / model such a change? TIA // stefan