gretl

gretl is computer software, an open-source statistical package, mainly for econometrics. The name is an acronym for Gnu Regression, Econometrics and Time-series Library.

It has both a graphical user interface (GUI) and a command-line interface. It is written in C, uses GTK+ as widget toolkit for creating its GUI, and calls gnuplot for generating graphs. The native scripting language of gretl is known as hansl (see below); it can also be used together with TRAMO/SEATS, R, Stata, Python, Octave, Ox and Julia.

It includes natively all the basic statistical techniques employed in contemporary Econometrics and Time-Series Analysis. Additional estimators and tests are available via user-contributed function packages, which are written in hansl. Output from gretl can be exported as LaTeX files.

gretl is available in English, Albanian, Basque, Bulgarian, Catalan, Chinese, Czech, French, Galician, German, Greek, Italian, Polish, European and Brazilian Portuguese, Romanian, Russian, Spanish, Turkish and Ukrainian. Gretl has been reviewed several times in the Journal of Applied Econometrics, and later in the Australian Economic Review.

A review also appeared in the Journal of Statistical Software in 2008. Since then, the journal has published several articles in which gretl is used to implement various statistical techniques.