The goal of this tutorial is to learn how to draw manually additional lines in ggplot.

The goal of this tutorial is to show the differents way a time series can be forecast from the simplest method to HoltWinters method.

The aim of this tutorial is to order a factor variable by the frequency of its levels in order to visualize it on plots in a smarter way.

The aim of this project is to use Data Analysis in order to analyze and predict the customer brand preference of two surveys. The first one is complete and contains the customer brand preference of two possible computers brands (Acer and Sony). The second one misses the information relative to the brand preferred. Complete data will be used in order to predict the brand preference of the registers with the missing information.