[Gretl-users] Gretl 1.8.0 released

[Riccardo (Jack) Lucchetti]

Version 1.8.0 of gretl is out. Here is a list of the major
changes with respect to 1.7.9. As usual, you can download the
latest version of gretl from

http://sourceforge.net/project/platformdownload.php?group_id=36234

USER EXPERIENCE
---------------
* Switch to compact tabular form for presenting model statistics

* Graphical User interface:
      - Add model menu item: "Modify model", under the Edit menu,
        provides a clone of the model specification
      - graph controller: new facility to add a line, defined
        via a formula, to an existing graph;
      - line-color selector: extend to 6 colors, and distinguish
        between setting the "palette" and setting ad hoc colors for
        a specific graph
      - Boxplots: hand the production of these over to gnuplot
      - relocate user-defined scalars from main window to the
        icon view window;
      - many other small improvements

* Data filters
      - add importer for SPSS .sav files
      - CSV importer: try to handle time-series data in reverse
        chronological order

* Many, many bug fixes

COMMANDS AND FUNCTIONS
----------------------
* New commands:
      - "intreg": interval (grouped data) regression
      - "modprint": makes it easy for script writers to format
        estimation output

* Improved commands:
      - "fcast": allow variables for the startobs and endobs
        arguments; add "rolling" k-step-ahead option
      - "gnuplot": now works in loops (batch mode only)
      - "loop": now more robust, more efficient and more general
      - "mle" and "nls": New option --numeric to force the use of
        numerical derivatives
      - "ols": add --jackknife option for robust standard errors and
        --anova for printing the ANOVA table
      - "ols" and "panel" (fixed effects): add option to calculate
        p-value for the Durbin-Watson statistic
      - "restrict": now available for nls, mle and gmm
      - "tsls": now offers the --liml and --gmm options as
         alternatives to two-stage least squares

* Modified commands:
      - var: the matrices returned by the accessors $sigma and $vcv
        for VAR systems now have a degrees of freedom correction

* Obsoleted commands: "rhodiff" and "hccm"

* New functions:
      - Add accessors $Fstat and $chisq for the overall F-statistic
        or chi-square test from the last model
      - boxcox(): Box-Cox transformation
      - mcovg(): matrix covariogram
      - mpols(): enables multiple-precision OLS for user-defined
        matrices
      - toepsolv(): solves a Toeplitz system of linear equations
      - urcpval(): gives user access to James MacKinnon's
        p-values for unit root and cointegration test statistics
        (tau)

* Improved functions:
      - mlag(): now handles multiple lags using a vector as the
        second argument
      - pdf(): Speed-ups when the function is applied to a series
        argument

Enjoy!

The gretl team.
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