In this document we apply multiple regression methods (linear and polynomial estimators) to obtain the best estimation of the seasonal mean precipitation in the Comunitat Valenciana (Spain), using the altitude and cartographic coordinates (XUTM and YUTM), as well as their product, as multivariate estimators or independent variables. The methodology is applied and the visualization of results done using R code and functions.Riutort Mayol, G.; Ruiz Fernández, LÁ.; Balaguer Beser, ÁA. (2021). Precipitation modeling using multiple regression in R. Universitat Politècnica de València. http://hdl.handle.net/10251/167681DE