Included in this software there is a large database which can be used as examples and moreover additional data can be downloaded directly from the Gretl web site. There is also a manual in pdf format (downloadable separately) which describes all kinds of analysis you can carry out in Gretl.
Gretl has an user interface with a menu by which you can open files or select the various modules to perform analyses.
Gretl files are in Xml format, but this sofware can also import files saved by spreadsheet.
Gretl is an extensible software, thanks to its internal scripting language and to its open source distribution.
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