The second data entry window is also checked for errors. If a C.V. is less
than or equal to zero, DECMATRX reports:
INPUT ERROR: C.V.
If a sampling cost is entered as a negative number, then the program is-
sues the following error message:
INPUT ERROR: COST
0
If any nonnumeric characters are entered for any of the means,
or costs, then one of the following messages will be displayed:
INPUT ERROR:
ENTERED
INPUT ERROR: C.V. INCORRECTLY ENTERED
INPUT ERROR: COST INCORRECTLY ENTERED
Pressing any key after. an error message has been reported will return
the program to the data entry screen with the error. Correct the error and
continue.
Documented Session
This example session with DECMATRX uses the following data:
Variable
25.0
95.
0.56
TP
25.0
0.28
1614.
TN
25.0
35.
0.52
CHLA
The object of the analysis is to determine sample sizes and costs as-
sociated with sampling these three variables over an annual period.
Sample sizes and costs for each variable are presented with respect to
error probability and precision. The results of the analysis can be used to
develop a sampling design within both
and financial constraints.
a
Chapter 2 Decision Matrices
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