Changes to Earth Package
------------------------

2.3-1 Feb 26 2009
    Doc touchups
    Added leaps::: prefix needed for new version of the leaps package
    Added style="max" to summary.earth
    Added labels param to plotd
    Reordered some of earth's arguments

2.3-0 Feb 18 2009
    Added the plotd function
    Removed some restrictions on type="class" in predict.earth
    Added sqrt. argument to evimp
    Added more grid lines to cumul density plot in plot.earth
    Added a help page section on interpreting the graphs in plot.earth
    Miscellaneous other touchups to code and docs

2.2-3 Feb 2 2009
    Added levels to the return value
    Added type=class and thresh arguments to predict.earth
    Thanks to Max Kuhn for suggesting these improvements

2.2-2 Jan 30 2009
    Doc touchups
    Cross validation MaxErr is now signed

2.2-1 Jan 22 2009
    Added cross validation i.e. the nfold and stratify parameters.

    We now scale y before the forward pass, for better numeric stability in
    the forward pass with very big or very small y's.
    For the old behaviour, set earth's new argument scale.y=FALSE.

    Added get.pairs.bagEarth so plotmo prints degree2 plots for caret:bagEarth models.

    Changes internal to earth.c:
        High values of trace argument are treated differently
        ServiceR (to allow interrupts) is called more consistently for large datasets
        Delta RSS handling is simplified
        Changed some var names for consistency
     The last two were a byproduct of experimental changes to earth that
     were not included in this release.

     Changed documentation to American English.

2.1-2 Nov 18 2008
    Touched up evimp help page.

2.1-0 Nov 15 2008
    plotmo now has better support for factors and for glm models
    na.action (always na.fail) is now handled as documented in earth.formula
    Added style="bf" to format.earth and summary.earth
    Fixed a few minor bugs and touched up documentation for evimp

2.0-6 Oct 30 2008
    You can now pass only the needed subset of columns to predict.earth
    Added plot.evimp
    Removed spurious warning "Need as many rows as columns"

2.0-5 Jul 14 2008
    Touched up documentation for format.lm.

2.0-4 June 22 2008
    Touched up code and documentation for a zero thresh value.

2.0-3 June 22 2008

Zero values are now allowed for earth's "thresh" parameter (previously if
    you used thresh=0, thresh was clamped internally to 1e-10).
    Also, if thresh=0, the MAX_GRSQ forward pass condition is ignored.
    The idea is to get as close to a big nk as possible
Changed "valid.names" argument of format.earth and format.lm to "colon.char"
    which achieves the same end more simply.

2.0-2 June 15 2008

Added column names to results of mars.to.earth, allows use of evimp.
Added valid.names argument to format.earth and format.lm.

2.0-1 June 10 2008

Added "namesx" and "first" arguments to the "allowed" function.
evimp() for a scalar x now returns a matrix (I added a missing drop=FALSE).

2.0-0 June 07 2008

Added support for glms and factors (but plotmo does not yet support factors).
Added variable importance function "evimp".
Added response weights argument "wp" to earth.
Output of summary.earth has changed to better deal
   with multiple response models, see the "style" argument.
Added namesx and namesx.org to earth's return value.

1.3-2 Mar 29 2008

Fixed two bad multiple response bugs:
a) for multiple reponse models, earth calculated the wrong null RSS and
   therefore the wrong RSq and GRSq for the sub-models.  (The total
   RSq and GRSq were correct.)
b) the wrong betas were used when pruning multiple response models.

Also fixed a bug where summary.earth printed the wrong number
of cases for multiple response models.

1.3-1 Mar 22 2008

"update.earth" now has a "ponly" argument, to force pruning only.
Because of this change, the "ppenalty" argument to earth is no longer
needed and has been removed.

Revisited text of warnings after I was bamboozled by one of
my own warnings.

Tweaked legend positioning in plot.earth.models.

1.3-0 Mar 18 2008

Default minspan is now 0 (was 1) for compatibility with mda:mars and
Friedman's MARS paper (I've flip flopped on this one).  This means
that models built with the default args will be little different to
before.

Earth's peak memory is now about 40% less.

Big models are now more responsive to ^C.

For multiple response models, we now print response names in most
places instead of just "Response N".

Removed get.nterms.per.degree and get.nused.preds.per.subset from
NAMESPACE and from help pages, to simplify user interface.

Fixed some niggling document issues and extended the FAQ.

1.2-2 Jan 2008

print.summary.earth now prints the call even for x,y interface to earth
plotmo now accepts x matrices without column names
Tweaked FindKnot and OrthogResiduals for speed
Removed a few shadowed variables in earth.c after running gcc -Wshadow
Clarified some paras in earth.Rd, reduced page width for better html display

1.2-1

Fixed a newvar.penalty bug introduced in previous release.
Added src/tests/test.earthmain.gcc.bat
More man page tweaks

1.2-0

Added linpreds, allowed, and Use.beta.cache arguments
Anova decomp is now more consistent
Added a few GPL headers
Reinstated the beta cache
More man page tweaks

1.1-5

Fixed bug reported by Joe Ritzer: long predictor names got munged in plotmo
Changed "class" to "response" throughout when used for the
predicted responses in the input y.
Man page tweaks based on user feedback.

1.1-4

Changed as.matrix to data.matrix in earth.default -- grep for FIXED
Extended earth.Rd slightly

1.1-2

Added my web page to DESCRIPTION and to some man pages

1.1-1

Changed \r\n to \n to pacify CMD CHECK

1.1-0

Default minspan is now 1 (was 0)
Fixed potential crash in PrintForwardStep if nTrace>1
Added a missing drop=FALSE to backward()
Minor code, comment, and man page fixups

1.0-8

Fixed bug where plotmo failed under these circumstances:
form <- Volume ~ .; a <- earth(form, data = trees); plotmo(a)

1.0-7

Minor change to summary.earth formatting.  Man page fixes.

1.0-6

Initial release