Disk No  823
Program Title: INTERACTIVE MATRIX CALCULATOR, INTERACTIVE REGRESSION ver 2
PC-SIG version 1
 
    MATRIX CALCULATOR operates on 20 matrix areas, numbered from 1 through
20. Each matrix may store 150 elements, the product of the number of rows
with the number of columns. Since the matrices are stored in contiguous
blocks, if only every other matrix, say numbers 1,3,5, etc., are used, then
up to 300 elements per matrix may be stored. Storage of 450 elements per
matrix is possible if only areas 1,4,7, etc. are used, 600 elements if only
1,5, etc. are used, and so on. Since the program makes no boundary checks,
the 151st element of a matrix will be placed into the first position of the
next matrix. Only one operation at a time is performed; i.e., only one
multiplication, one addition, etc. Results may be displayed at any time
using the Print command. The storage limit of 20 matrices may be extended
by using the disk for additional storage and retrieval.
 
    The idea of INTERACTIVE REGRESSION is that the researcher knows his
data best. Rather than provide canned variable selection routines, the
researcher is prompted for the next step each time the model changes due to
the addition or deletion of a variable. At any particular step, variables
that are in the equation may be deleted, or variables which are not in the
equation may be added. No provision is made for residual analysis since no
data is stored. This is a serious limitation of the program in terms of
modern regression analysis procedures. The program is invoked by giving the
command STEPREG and then reading the opening screen which follows. An
annotated example of the interactive analysis of the Hald data is then
presented. Explanatory notes are set apart by "******" borders.
 
Usage: Statistical Analysis
 
System Requirements: 128K of memory and one floppy drive.
 
How to Start: Type MATRIX (press enter). We suggest that you read the
documentation before running any program. In order to read the
documentation type: COPY *.DOC PRN (press enter).
 
Suggested Registration: $25.00
 
File Descriptions:
 
HALD     DAT  Hald data file for stepwise regression.
LONGLEY  DAT  Longley data file for stepwise regression.
MATRIX   DOC  Documentation for interactive matrix calculator.
MATRIX   EXE  Compiled version of interactive matrix calculator.
READ     ME   Introduction file.
STEPREG  DOC  Documentation for stepwise interactive regression program.
STEPREG  EXE  Compiled version of stepwise interactive regression program.
WAMPLER  DAT  Wampler data file for stepwise regression.
HALD     MTW  Hald data as a saved matrix worksheet.
 
PC-SIG
1030D E Duane Avenue
Sunnyvale Ca. 94086
(408) 730-9291
(c) Copyright 1987 PC-SIG Inc.