In many applied sciences most data sets have a spatial component. For the study of these data the result must be analyzed depending on the geographical coordinates. Therefore the data are presented in maps. A method to display data on a map is to group the data and represent each group by a symbol. There are different methods to find such groups or classes, e.g. absolute class borders, classes defined by the percentiles based on the order statistics or classes based on the boxplot. Other methods for creating maps are growing dot maps and interpolated maps. In growing dot maps classes are avoided, therefore the symbol size grows continuously in relation to the data.
This thesis describes the generation of maps with R. The programs are included in the DAS+R package which offers a graphical user interface to R. (See http://www.statistik.tuwien.ac.at/public/dutt/DASplusR/ .)