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┌─────────────────────────────────────────────┐
│ March 1993 NEWSLETTER │
┌───────────┴─────────────────────────────────────────────┴────────────┐
│ ╥───┐ ╖ ┌─ │
│ ║ │ ╙╖┌─┘ │
│ ╓─┐ ╓─┐ ╓── ─╥─ ╟─┬─┘ ╙┼╖ ╓─┐ ╖ ┌ ╓─┐ ╥─┐ ╥─┐ ╥ ┌ ┌ ╓─┐ ╥─┐ ╥─┐ │
│ ╙─┐ ║ │ ╟─ ║ ║ └┐ ┌─┘╙╖ ╙─┐ ╟─┤ ╟─┤ ╟┬┘ ╟─ ║ │ │ ╟─┤ ╟┬┘ ╟─ │
│ ╙─┘ ╙─┘ ╨ ╨ ╨ └ ─┘ ╙ ╙─┘ ╜ └ ╜ └ ╜└─ ╨─┘ ╙─┴─┘ ╜ └ ╜└─ ╨─┘ │
└───────────┬─────────────────────────────────────────────┬────────────┘
│ softRX is a trademark of │
│ The Software Prescriptions Company │
├─────────────────────────────────────────────┤
│ Bob Obenchain, Ph.D. │
│ 5261 Woodfield Drive North │
│ Carmel, IN 46033-8795 │
│ (317) 580-0144...voice │
│ 72007,467...CompuServe │
│ OBENCHAIN_ROBERT_L@LILLY.COM...Internet │
└─────────────────────────────────────────────┘
softRX shareware coverage in The American Statistician
======================================================
The August 1991 issue of The American Statistician [Volume 45,
Number 3, New Developments in Statistical Computing] published
our announcement entitled "Ridge Regression Systems for MS-DOS
Personal Computers" on pages 245-246.
The November 1992 issue of The American Statistician [Volume 46,
Number 4, Statistical Computing Software Reviews] published John
C. Nash's review "Statistical Shareware: Illustrations From
Regression Techniques" on pages 312-318. The following are some
of the highlights of Nash's comments on softRX shareware...
"To succeed in educating users to the possibilities that
exist, software containing new ideas must not only be
inexpensive and well documented, but also easy to use and
understand."
"Of the software reviewed, RXridge is the easiest to use."
"RXridge has an interface that is equal to that of many
commercial packages, and allowed the program to be tested
without reading any documentation."
"A carriage return should, as far as possible, be a sensible
input response for controlling a program. This requires some
thought as to what the default response should be. Obenchain,
in RXridge, has clearly spent some effort in this direction."
"It is useful to have the techniques of ridge regression
competently packaged as they have been here."
softRX systems.............................for MS-DOS Personal Computers
========================================================================
RXRIDGE.EXE/.DOC.............................revised, Jan. 1993
This totally interactive C-language module performs three
types of normal-theory maximum likelihood ridge computations:
Classical, Random-Coefficients, and Empirical Bayes. It
features user-friendly windows, menus, graphics, and visual
review of ridge files that have been written to disk. RXridge
can handle "exact" singularities, and "bugs" that caused
crashes with earlier versions of the software have been fixed.
[Compacted using LZEXE 0.91 (c) Fabrice BELLARD.]
RXTRACES.EXE/.DOC............................revised, Jan. 1992
Interactive CGA graphics displays of 5 types of ridge TRACES,
including estimates of: regression coefficients, scaled mean
squared errors, excess (ols minus ridge) eigenvalues, inferior
direction cosines, and the overall shrinkage pattern. RXtraces
is ideal for ridge "training" applications in which students
simply review RXridge or RelaxR outputs across a spectrum of
previously-computed numerical examples. (LZEXE 0.91 compacted.)
PATHPROJ.EXE/.DOC...........................revised, January 1992
Interactive CGA graphics displays of the projection of ridge
shrinkage path statistics (regression coefficients and inferior
direction, regressor coordinates) onto any 2-dimensional linear
subspace (specified via orthogonal direction cosine vectors.)
Literally "watch" the inferior direction change as one moves
along the ridge shrinkage path! (LZEXE 0.91 compacted.)
RELAXR.EXE/.DOC...........................revised, February 1990
90% of the functionality of this Fortran implementation is now
provided [in a significantly more user-friendly environment] by
RXridge. However, RelaxR provides some extra details and ridge
residual analyses. And I will send you the Fortran source code
for RELAXR if you send me a disk with a stamped mailer or $15.
ARXFILES.EXE.....................................September 1992
Archive of .ARX batch input files for input to RXridge are
available for 16 well-known numerical examples from statistical
literature of ill-conditioned regression models. Ideal for
developing ridge training materials using RXridge (for student
review using RXtraces & PathProj.)
RXRRISK/RXRSIMU...................expected availability: UNKNOWN
Generalized ridge regression CGA-graphics training tools that
display the exact risk associated with shrinking known "true"
regression coefficients. And simulation tools for adding random
noise to exact data for validation of conventional ridge
analysis software as well as for display of exact loss traces.
softRX Statistical Code...for GAUSS, SAS/IML & S
=======================================================================
Generalized ridge regression computations, graphical TRACE
displays, maximum likelihood solution selection (classical,
empirical Bayes, and random coefficient methods) and normal
distribution ridge simulation scenarios are supported. Source
code for all 3 systems would fit on one 5.25" 360K disk.
RXRIDGE....generalized ridge regression data analysis, with traces.
RXRCRLQ....classical maximum likelihood shrinkage "shape" selection.
RXRMAXL....classical, empirical Bayes, & random coefficient methods
of maximum likelihood shrinkage "extent" selection.
RXRRISK....true ridge risk when signal & noise parameters are known.
RXRSIMU....simulated responses and their true ridge loss when signal
and noise parameters are known.
softRX Distribution POLICY and PRICES
=======================================================================
softRX shareware distributions of electronic information include -
MS-DOS personal computer EXE modules; ASCII documentation files;
numerical example batch input files; and source code files for
GAUSS, SAS/IML, or S. Most softRX shareware archives can be
downloaded from CompuServe IBMAPP (the IBM Applications Forum,
Library 13 - Tech/Engr/Sci.) To receive a softRX shareware
distribution via U.S. Mail, send either
...your check for $15 per MS-DOS floppy disk, or
...formatted MS-DOS disks with stamped, self-
addressed return mailers for disk(s).
The registration fee for each stand-alone EXE module is $25. This
payment is mandatory for use in any commercial or government
environment. Registration entitles a single user to: mail-in
support, printed documentation, and notification of system
upgrades via this newsletter. And you can register any three
softRX products for the cost of two ($50.)
In addition to registration fees, you should also send MS-DOS
disks and stamped, self-addressed return mailers (or $15 per
disk) if you want the very latest version of all files in the
shareware distribution.
softRX C-language source code license fees are $100 per product
(or three for $200.) But I provide C-language source code only
after you have signed and returned a softRX licence and
non-disclosure agreement. [You would need to own the South
Mountain Software 2.0 Graphics library to recompile softRX display
systems. And source code files for the computational equivalent
of "Numerical Recipes in C" matrix decomposition routines would be
required to compile customized versions of certain RXridge
computations.]
softRX Professional Consultation $50.00/hour
=======================================================================
softRX does not provide telephone support for our software
systems. If you have registered a softRX shareware product and
have specific, technical questions about how to perform ridge
regression analyses using that product, please send your
questions to us in writing. If you prefer to use electronic
mail, I can be reached as user [72007,467] on CompuServe or
OBENCHAIN_ROBERT_L@LILLY.COM on internet.
On the other hand, if you have urgent questions on "general"
ridge strategy/tactics or on possible interpretations of outputs
for proprietary datasets, you may consult with us by telephone
for $50/hour plus toll charges.
Telephone consultations must be pre-arranged for either
evening or weekend hours, with an advanced deposit of at
least $50. If you call at the pre-arranged time and I'm
unable to help you, I will immediately refund your deposit.
If you are willing to release a (smallish) data set for public
distribution and there is no particular "rush," no fee will
usually be charged for its analysis. Simply send me an MS-DOS
disk with your data in an ASCII file. Each variable (column)
must be labeled with an understandable "name," and relevant
background information must also be provided. However, unless
your dataset turns out to illustrate interesting analysis
points/problems, you will probably end up receiving only very
brief feedback directly from us.
softRX Newsletter and User Feedback $5.00/year
=======================================================================
If you want to receive the softRX newsletter, you could simply
register 1 (or more) softRX shareware products. But you have
other options too! You could send me $5.00 per year to pay
for postage and handling. Or I will keep you on the softRX
mailing list if you write me "regularly" giving feedback, bug
reports, and/or suggestions for improving softRX shareware
products.
┌────────────────────────────────────────────────────────────────┐
│ softRX is a trademark of the Software Prescriptions company. │
│ "Personal computing treatments for data analysis infirmities." │
│ Copyright(c) 1985 by Bob Obenchain, Ph.D. │
│ ALL RIGHTS RESERVED │
└────────────────────────────────────────────────────────────────┘