Hello, I am currently trying to build a statistical model using MARS (multiple adaptative regression splines) with package library "earth" v3.2-3 However I could not find a way to add a circular predictor, namely the wind direction [0-360°] . In GAMS (library "mgcv") there is the possibility to use special spline commands such as s(X,bs="cp") or s(X,bs="cc"). Would you know of anything similar for MARS ? Thanks and regards, Pierre master student Geneva [[alternative HTML version deleted]]