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Specifications & Support Information:
This area describes the process that H & H Servicco Corp. used to validate the programs: ASP, TP105, TP414, TP781.
1 Validation of the algorithm code:
Each program is based on the calculations of a national
sampling standard or a published article. That reference was then used to validate the
calculation by reproducing the results of the standard.
1A) Sampling Standards:
1B) Books, Articles, and Statistical Tables:
2 How program results compare to standards:
You can verify compliance to a standard yourself by
selecting a sampling plan from the standard and entering it into the program as decision
rule input (choose the "D" method of input). For example, from Mil-Std-105,
choose n,Ac. Or, from Mil-Std-414, choose n,K. This will reproduce the OC Curves that are
published in the standard.
Special Note: If you choose the plan for variables
(K-method) from Mil-Std-414, TP414 will reproduce the OC curve exactly. If you choose it
from ANSI/ASQC Z1.9, there will be a slight difference because of a known error in the
graphs in Z1.9. TP414 gives the correct result.
3 Robustness to extreme input data:
For each data input type, extreme values were input to
assure robustness of the program code. Subroutines that calculate probability
distributions were compared to published tables, covering the range of the tables:
binomial, poisson, normal, students t, exponential.
4 Warning messages and disallowed input:
The programs notify the user when he/she inputs values
that will produce inaccurate results. Depending on the situation, there may be either
warning messages or prohibited input. Most values have this type of internal check.
5 Product release testing:
The first commercial program was TP414 sold in 1986.
There has not been even one numerical error reported by users -- which is a testimonial to
the efficacy of acceptance sampling.
7 Year 2000:
The only date related variable in the programs are the system date that prints at the bottom of each printed (but not onscreen) report. This line is intended to document the program that produced the report, the version number, and the date. Software with file dates (.exe file) prior to 7/2/1997, will not print that documentation line after 1999. Program files dated after 7/2/1997 will not be effected by Y2K.