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Gretl is a cross-platform, free, open-source econometrics and time-series analysis package (GNU Regression, Econometrics and Time-series Library). It provides a wide range of estimators and models—including OLS, ML, GMM, panel data, limited dependent variable models, ARIMA, GARCH, VAR/VECM, and cointegration tests—and features a scripting language (Hansl), a GUI, and LaTeX-formatted output with support for multiple data formats. Gretl integrates with GNU R, GNU Octave, Python, Julia, Ox and Stata, supports MPI parallelization, and offers extendability through function packages and a Python interface (gretl4py).
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en.wikipedia.org shapes more of what AI says about Gretl than any other source, at 100% of its citations.