|The DTREE Procedure|
When PROC DTREE detects an error, it displays a message on the SAS
log to call it to your attention.
If the error is in a statement other than
the PROC DTREE statement
and the QUIT statement, and if the
ERRHANDLE=QUIT option is not
procedure ignores the erroneous
statement and waits for you to enter another statement.
gives you a chance to correct the mistake you made and keep running.
You can exit the procedure at any time by specifying the
If the error is in an input data set, typically, you will have to
edit the data set and then reinvoke PROC DTREE.
In one case, however, you can use an option to correct the problem.
You may receive an error message indicating that the sum of
probabilities for a particular chance stage does not equal 1.0.
If it is caused by roundoff errors in the summation, then you can
reset the TOLERANCE= option to correct this error. For
example, suppose that your problem contains a chance stage that has three
Out2' and `
Out3', and each has
probability 1/3. Suppose also that you input their probabilities
in the PROBIN= data set as follows:
Out1 Out2 Out3 0.3333 0.3333 0.3333
Then, PROC DTREE detects the total probabilities for that stage as 0.9999, not equal to 1, and hence displays an error message. The following RESET statement fixes the error:
Alternatively, you can specify the AUTOSCALE option to ask the procedure to rescale the probabilities whenever this situation occurs.
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.