|Details of the OPTEX Procedure
PROC OPTEX Statement
- PROC OPTEX <options> ;
You use the PROC OPTEX statement to invoke the procedure.
The following options can be used:
specifies which type of coding to use for modeling effects in the design.
Coding equalizes all model effects as far as the optimization is
concerned. The default is CODING=STATIC, which specifies that the values
of all effects are to be coded to have maximum and minimum values of +1
and -1, respectively. The options CODING=ORTH and CODING=ORTHCAN specify
orthogonal coding with respect to the input points. The option CODING=NONE
suppresses coding of effects; it is equivalent to the NOCODE option. For
more details on coding, see "Design Coding"
Note that while CODING=STATIC is the default, CODING=ORTH will usually
give more appropriate efficiency values, especially if all possible
combinations of factor levels occur in the candidate data set.
specifies the input SAS data set that contains the candidate
points for the design. By default, the OPTEX procedure uses the most
recently created SAS data set. For details, see "DATA= Data Set"
specifies the smallest value that is considered to be nonzero for
determining when the search is
no longer yielding an improved design and when the information
matrix for the design is singular. By default, = 0.00001.
specifies the length of effect names in tables and output data sets
to be n characters long, where n is a value between 20 and 200
characters. The default length is 20 characters.
suppresses the coding of effects in the model for the design. This option
is equivalent to CODING=NONE.
suppresses all output. This is useful when you only want the
final design to be saved in a data set.
specifies a number s
used to start the pseudo-random number generator (see "Search Methods"
). The number s
can be any positive
integer up to 231-1. The
default value of s is
generated from the time of day.
specifies that the status of the search be checked at the given level, where
status-level is an integer between 1 and 4, inclusive. If you specify
a status-level then a table of the status at each check point is
displayed. You can use this table to track the progress of long searches. The
allowable status-levels are listed in the following table:
Checks status after each:
|1||design search; the number of searches
specified by the NITER= option|
|3||internal search loop|
|4||extra internal search loop for METHOD=M_FEDOROV|
Each search method loops to produce successively better designs; these are
the search loops for STATUS=2. STATUS=3 and STATUS=4 refer to deeper
loops within the search methods. You will only need to specify STATUS=3
or STATUS=4 very rarely, since unless simply evaluating a potential switch is
very expensive (as it can occasionally be with the space-filling criteria).
Evaluating and displaying the status at this level will make the search much,
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.