& Schreiber (2012). The authors conclude "Our results show that the RNG related procedures in gretl are implemented soundly and perform well in the three crush test suites of the TestU01". Gretl as a teaching tool Due to its libre nature and the breadth of econometric techniques it contains, gretl is widely used for teaching econometrics, from the undergraduate level onwards. Datasets in gretl format are available for several popular textbooks. The following is a list of textbooks that use gretl as their software of choice: Dougherty, Christopher Introduction to Econometrics (Oxford University Press) Kufel, Tadeusz Ekonometria (Wydawnictwo Naukowe PWN); in Polish (Russian version also available) In addition, a free supplement to Hill, Griffiths and Lim Principles of Econometrics (Wiley) is available. See also Comparison of statistical packages R (programming language) References External links GretlWeb Gretl User's Guide Lee Adkins's Using gretl for Principles of Econometrics Gretl Command Reference Gretl Conference. Berlin, 2015 Cross-platform free software Cross-platform software Econometrics software Free econometrics software Free multilingual software Free plotting software Free software programmed in C Free statistical software GNU Project software Numerical analysis software for Linux Numerical analysis software for macOS Numerical analysis software for Windows Numerical programming languages Numerical software Plotting software Regression and curve fitting software Science software that uses GTK Statistical programming languages Time series software