ViSta - The Visual Statistics System 
Copyright (c) 1991-98 by Forrest W. Young

This file is a history of ViSta changes and fixes.

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Release 5.0.5.1, April 10th, 1998 - Minor Release - MS-WINDOWS
Release 5.0.5, March 29th, 1998 - Minor Release - MS-WINDOWS and MAC
Release 5.0.4, March 23rd, 1998 - Unannounced MS-WINDOWS release
Release 5.0.3, March 16th, 1998 - Unannounced MS-WINDOWS release
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This release fixes bugs, and improves some aspects of the user interface.
1) Fixed a bug which caused an error message for the Edit Data menu item.
2) Luke Tierney fixed a bug which prevented color allocation for 32-bit color.
3) Improved the way Save Data works when the Datasheet is open.
4) Improved Datasheet positioning and sizing.
5) Datasheet now remembers its location, size, and data format and saves
these with the data object.
6) Added a main dialog for the Configure menu item.
7) Expanded the Univar report.
8) Minor changes made to QPlots.
8) Larger simulated data can be generated.
9) Added a Prefs directory to contain preference files.
10)Minor changes to screen layout.
11)Added Kernel Density functions to Histogram.
12)5.0.5.1 includes LispEdit as fixed by Luke Tierney

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Release 5.0.2, February 28th, 1998 - MAJOR RELEASE - MS-WINDOWS AND MAC
Release 5.0.1, February  3rd, 1998 - Unannounced preliminary version
Release 5.0.0, January   6th, 1998 - Unannounced preliminary version
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Release 5.0.2 is the most significant upgrade since October 1996.

OVERVIEW: ViSta is now much more suited for use in Introductory
Statistics courses. It now has an extensive help system, and has
visualizations for univariate, bivariate, and classification data, as
well as for simple regression. It can also perform unbalanced ANOVA.
Data management has been simplified.  Color has been added throughout.
The new features are summarized below.

HELP: The major changes include a new help system. The system includes
a Help menu, an "About These Data" menu item, help for menu items, help
for spreadplots, and help for all graphics windows. The graphics
windows have a help button, as well as an item in the Help menu.

ANALYSES: ANOVA can analyze unbalanced data. ANOVA and UNIVAR no longer
must use table data, eliminating the need for table data, and thereby
simplifying data management.  Errors in UNIVAR have been fixed.

VISUALIZATIONS: Color has been added to the visualizations. New
visualizations are available for univariate and bivariate data, for
simple regression, and for bivariate multiple regression. Nearly all
previous visualizations have been improved, some with major
modifications. Boxplots have been enhanced, including an option for
parallel coordinate plots. Spreadplot windows always close. Spreadplot
layout and management has been improved.

MISCELLANEOUS: Reports have been improved for ANOVA, UNIVAR and
PRINCOMP. Color has been added throughout. A text window is
available for MS-Windows. Messy windows have been eliminated. There is
a new dynamic opening screen, ABOUT VISTA and screen-saver. WorkMap
icon layout has been improved. Desktop layout has been improved.

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Release 4.29S, DECEMBER 1st, 1997 - MAJOR RELEASE - SPANISH TRANSLATION
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The menu interface, messages and dialogs have been translated into
Spanish by  Dr. Pedro M. Valero-Mora, Facultad de Psicología,
Departamento de Metodologia, Psicobiologia y Psicologia Social,
Universitat de Valencia, Valencia, Spain. This release also includes
all of the changes that are in release 4.28, described below.

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Release 4.29, SEPTEMBER 1st, 1997 - MINOR RELEASE
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Minor menu changes: The Save Data and Save Model menu items moved to
File menu so that they can be used while the Datasheet is open. File
menu rearranged. Dribble menu item changed to Record Listener.

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Release 4.28F, AUGUST 1st, 1997 - MAJOR RELEASE - FRENCH TRANSLATION
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The menu interface, messages and dialogs have been translated into
French by  Louis Le Guelte, Laboratoire de Socioécologie et
Conservation, Univ. Lyon I., Lyon, France. This release also includes
all of the changes that are in release 4.28, described below.

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Release 4.28, AUGUST 1st, 1997 - MINOR RELEASE - WINDOWS and MACINTOSH
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New features: 1) GuideMaps and Help are finished (thanks to Louis Le
Guelte for motivation) 2) New SHOW MENU HELP menu item for providing
help with using menus.

Bugs Fixed: 1) Sort-permute transformation has  "sort-by-variable" as
default 2) Sort-permute transformation always sorts selected variable
3) Sort-permute transformation can sort ordinal or category variables
4) Rank transformation now handles ties correctly. 5) Rank
transformation can rank ordinal variables 6) Error msg improved when
can't import data 7) Preference to show guidemap no longer causes
loading errors 8) Load Model menu item enables 9) Works more easily as
a Netscape helper for MS-Windows 10) Summary stats window now shows
last line under Unix and Windows 11) Open Data, New Data, Simulate
Data, and Import Data can be used to author guidemaps 12) Load-vista
and prepare-to-quit functions no longer write protected files 13)
Eval-selection and Edit-selection no longer give error if listener not
active 14) Compiling facility improved 15) Dialog boxes presented with
guidemaps 16) GuideMaps errors reduced.

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Release 4.27, March 14th, 1997 - MAJOR RELEASE - ALL OPERATING SYSTEMS
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This is a major new release. The main new aspects are: 1) Data
simulation. 2) Central Limit Theorem Visualization. 3) ViSta for Unix
has all the features in ViSta for MSWindows and MacOS. 4) The handling
of missing values has been improved. 4) Compiled code is provided to
improve efficiency.

This release is available for all platforms, unifying the code for all
platforms for the first time.

DATA SIMULATION: Data can be simulated by sampling from any of 10
hypothetical population distributions.

CENTRAL LIMIT THEOREM VISUALIZATION: The data simulation feature
includes an optional visualization which interactively demonstrates the
central limit theorem. A click of the mouse generates one (or several)
new samples whose means and standard deviations are added to histograms
of their sampling distributions.

VISTA FOR UNIX: ViSta for Unix now includes all of the major new
features and minor changes first introduced in release 4.23m of ViSta
for the Mac and release 4.24 of ViSta for MSWindows. In addition,
window and dialog layout, input and output file dialog boxes, graphic
fonts, and the exit process have been improved in the Unix version.

BUG FIXES: Several bugs have been fixed in all versions of ViSta. These
include: 1) Data with missing values are imported properly 2) Data with
missing values propagate properly during data management. 3) There is a
new option for row-wise removal of data with missing values. 4) Summary
Statistics are reported for the selected subset of variables. 5)
Univariate Analysis performed on the selected numeric variable. 6)
Univariate Analysis reports correct confidence intervals. 7) Regression
Analysis added variable plot now has an X-axis button. 8) Regression
Analysis module does robust regression when requested in the dialog
box. 9) Sort-Permute works on Category and Ordinal variables.

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Release 4.26, October 30th, 1996 - MINOR RELEASE
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Fixes a bug that prevents the New Data menu item from working, and
corrects a problem caused when using the carsreg.lsp example.

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Release 4.25, October 28th, 1996 - MINOR RELEASE
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This minor release updates certain messages, functions and methods to
correspond with their descriptions in the new monograph entitled
"ViSta: Developing Statistical Objects"

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Release 4.24, October 7th, 1996 - MAJOR MSWINDOWS RELEASE
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The major new features and minor changes first introduced in version
4.23m of ViSta for the Mac, are now available for ViSta for MSWindows.

This release is available for both MSWindows and MacOS, fixing minor
bugs in the previous Mac release, mainly in the new univariate
regression module.

Minor bugs in the regression module of version 4.23m of ViSta for the
Mac have been fixed. These include: 1) A timing problem in certain
analyses 2) Axes were scaled incorrectly in some visualization windows
3) Robust residuals were plotted wrong in the visualization 4) The
added variable plot was wrong in the visualization 5) It wasn't
possible to analyze data with inactive variables.

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Release 4.23m, September 15th, 1996 - MAJOR MACINTOSH RELEASE
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Introduces major new (and improved) data analysis and visualization
methods.

Major new features include: 1) A new OLS, robust and monotonic
regression module. 2) Redundancy analysis (new option of the
multivariate regression module). 3) Extensive visual regression
diagnostics. 4) A visualization method for Univariate Analysis. 5) A
completed visualization method for Analysis of Variance. 6) An improved
visualization method for Multivariate Regression. 7) A multivariate
regression test.

In addition, the following minor changes have been made: 1) Import Data
works with strings as well as symbols and numbers. 2) Create-Data can
remove rows of multivariate data with missing values. 3) Datasheet menu
items now allow adding several obs/vars simultaneously. 4) Datasheet
shows matrix names for matrix data. 5) Datasheet window scrolling and
sizing improved.

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Release 4.22, January 8th, 1996 - MINOR RELEASE
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Several minor bugs in the size, location and closing of spreadplot
windows in the MS-Windows version have been eliminated.

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Release 4.21, December 17th, 1995 - MAJOR MACINTOSH RELEASE
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This release should be much more robust on the Macintosh than earlier
releases, due to the bug fixes described below.  If you are using an
earlier version of ViSta, especially on the Macintosh, you are strongly
urged to use this version instead.

NEW FEATURES 1) A new Univariate Analysis module is included, which
does t- or Z-tests (and confidence intervals) for one sample, two
paired samples or two independent samples, and does Mann-Whitney and
Wilcoxen tests in appropriate cases. The visualization is not yet
available. 2) The name of the "Show-Datasheet" item has been changed to
"Edit Datasheet". Associated with this change, "Open Data" has been
changed to do a "Browse Data" rather than a "Show Datasheet" after the
data are loaded.  Also, double-clicking a data icon now does a "Browse
Data" rather than a "Show Datasheet".

BUG FIXES 1) Macintosh exit bug fixed. 2) Bugs have been removed from
"Create Data". 3) A bug has been removed when converting table data to
multivariate class data.

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Release 4.20, November 26th, 1995 - MINOR RELEASE - ALL OPERATING
SYSTEMS
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NEW FEATURES The File and Analysis menus and the WorkMap's toolbar have
been revised in preparation for additional analysis capabilities being
prepared.

BUG FIXES 1) Macintosh WorkMap redraw bug fixed. 2) Macintosh exit bug
fixed. 3) A Macintosh low memory warning dialog has been added.

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Release 4.12, October, 1995 - MINOR MACINTOSH RELEASE
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This release of ViSta fixes bugs in the Macintosh version.

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Release 4.08, July 19th, 1995 - MAJOR RELEASE - ALL OPERATING SYSTEMS
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The main new feature in this release is a datasheet editor with which
you can create and manipulate datasets.  You can now import data from a
text file, and double-click data icons to open their datasheets. The
transformation menu has been completed, as have the data manipulation
features for matrix data.  Other new features have been added and many
features that were previously incomplete have been completed. See below
for more details.


DATASHEET EDITOR: A datasheet editor is now available. It allows you to
edit existing data and to enter new data. You no longer have to prepare
datafiles using lisp statements, although these previously described
features are available. The datasheet is accessed through the SHOW
DATASHEET item of the DATA menu, and the NEW DATA, OPEN DATA, and
IMPORT DATA items of the FILE menu. The BROWSE DATA item of the DATA
menu also displays data in datasheet form but does not allow editing.
You cannot analyze a data object when its datasheet is open.

IMPORT DATA: A new FILE menu item is available for importing
multivariate data.  The data being imported must be in a text (ascii)
file.  The first line of the file specifies the data for the first
observation.  Succeeding lines specify the data for succeeding
observations, and must contain the same number of data elements as are
on the first line.  Data elements must be separated by spaces.

WORKMAP: Double-clicking a data icon opens the data to reveal the
data's datasheet. Double-clicking a model icon opens the model to
reveal the model's report. For MS-WINDOWS, you can now open a reduced
(iconized) window from the icon.You can also open the window from the
WINDOWS menu as well as the COMMAND window.

TRANSFORMATION MENU: The transformation menu has been completed.  There
are 30 transformations now available, plus a user-defined menu item
that gives access to additional user-defined transformations.

MATRIX DATA: Data manipulation features for Matrix Data have been
completed.  You can now subset matrix data by matrix or by row/column,
and you can merge separate matrix data objects into one.

OPEN DATA, LOAD DATA and IMPORT DATA: These menu items now always open
to the data folder. To support this, the data folder has been
restructed.

DATA and MODEL menus: These menus have been modified so that menu items
for data and model object names are optionally appended to the end of
the menus, rather than always being appended.  The option is controlled
by a new preference feature. This takes care of a MS-WINDOWS problem
with menus being too long for the screen.

ANALYSIS OF VARIANCE: SAVE MODEL and CREATE DATA menu items have been
implemented. VISUALIZE MODEL is still not completed.

CORRESPONDENCE ANALYSIS: Now analyzes all active numeric data rather
than all numeric data.

PRINCIPLE COMPONENTS: The visualization has been slightly improved.

BUG LIST: A BUG LIST menu item has been added to the COMMAND menu.  It
lists known bugs and tells you how to report unknown bugs that you
discover.