Functions are provided to determine production frontiers and technical efficiency measures through non-parametric techniques based on regression trees. The package includes code for estimating radial input, output, and directional and additive measures, plotting graphical representations of the scores and the production frontiers by means of trees, and determining rankings of the importance of input variables in the analysis. Additionally, an adaptation of Random Forest by a set of individual Efficiency Analysis Trees for estimating technical efficiency is also included.