Gretl Manual: Gnu Regression, Econometrics and Time-series Library
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# Acknowledgements

My primary debt is to Professor Ramu Ramanathan of the University of California, San Diego. A few years back he was kind enough to provide me with the source code for his program `ESL` ("Econometrics Software Library"), which I ported to Linux, and since then I have collaborated with him on updating and extending the program. For the `gretl` project I have made extensive changes to the original `ESL` code. New econometric functionality has been added, and the graphical interface is entirely new. Please note that Professor Ramanathan is not responsible for any bugs in `gretl`.

I am grateful to the authors of several econometrics textbooks for permission to package for `gretl` various datasets associated with their texts. This list currently includes William Greene, author of Econometric Analysis; Jeffrey Wooldridge (Introductory Econometrics: A Modern Approach); James Stock and Mark Watson (Introduction to Econometrics); Damodar Gujarati (Basic Econometrics); and Russell Davidson and James MacKinnon (Econometric Theory and Methods).

GARCH estimation in `gretl` is based on code deposited in the archive of the Journal of Applied Econometrics by Professors Fiorentini, Calzolari and Panattoni, and the code to generate p-values for Dickey Fuller tests is due to James MacKinnon. In each case I am grateful to the authors for permission to use their work.

With regard to the internationalization of `gretl`, I wish to thank Ignacio Díaz-Emparanza, Michel Robitaille, Cristian Rigamonti and Tadeusz Kufel, who prepared the Spanish, French, Italian and Polish translations respectively.

I have benefitted greatly from the work of numerous developers of open-source software: for specifics please see Appendix B to this manual. My thanks are due to Richard Stallman of the Free Software Foundation, for his support of free software in general and for agreeing to "adopt" `gretl` as a GNU program in particular.

Many users of `gretl` have submitted useful suggestions and bug reports. In this connection particular thanks are due to Ignacio Díaz-Emparanza, Tadeusz Kufel, Pawel Kufel, Alan Isaac, Cri Rigamonti and Dirk Eddelbuettel, who maintains the `gretl` package for Debian GNU/Linux. Besides making good suggestions, Riccardo "Jack" Lucchetti has contributed substantial code and econometric expertise.

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