This document is a handbook for using QtiPlot, a program for two- and three-dimensional graphical presentation of data sets and for data analysis. -The second chapter is a tutorial on how to obtain plots from different data sets. It is the one you need to read first to understand the basics of QtiPlot and to be able to draw plots. -The three following chapters are descriptions of all the commands, buttons and dialogs used in QtiPlot. These chapters are the reference manual of QtiPlot. – The two following chapters describe more deeply some specific possibilities of QtiPlot, that is the statistical and mathematical analysis of data, and the scripting. Legal notice: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation, with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. Source.