Sampling Plans  Site Map 
Software Area:

Acceptance
Sampling:

Poisson Examples of
TP105 Sampling Plans for Count Data 
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 Decision Rules
 Fixedn decision rule
 Sequential decision rule table
 Sequential decision rule diagram (text)
 Sequential decision rule exported & displayed as an MS Excel chart
 Sequential slope and intercept
 Performance Curves (for matched fixedn & sequential plans)
 Performance curve tables by Pa
 Performance curve tables by p'
 OCCurve graph (text)
 OCCurve graph exported & displayed as an MS Excel chart
 AOQCurve graph exported & displayed as an MS Excel chart
 ASNCurve graph exported & displayed as an MS Excel chart
 ARLCurve graph exported & displayed as an MS Excel chart
Fixedn Decision Rule for Count Data
The sampling plan documents the type of plan, the two points on the occurve that specified the plan, the decision rule, and the date and version of the software.
Sequential Decision Rule: nTable for Count Data
The ntable refers that you enter the table with the left two sample size (n) columns.
Sequential Decision Rule: XTable for Count Data
The xtable refers that you enter the table with the left defectives (x) column.
Sequential Decision Diagram for Count Data (text)
The minimum and maximum sample sizes shown in the reports footer above can be verified by the diagram. The minimum n to accept = 2 occurs when the first two sampled items contain zero defects. The minimum n to reject =1 occurs when the first sampled item has 5 defects. The maximum n = 7 sampled items is the righthand truncation of the continue zone. The truncation is usercontrolled but otherwise defaults to a goodpractice value. The 'maximum' ASN =4 sampled items is the maximum of the ASN curve.
Sequential Sampling Plan for Count Data from TP105
Displayed as an MS Excel Chart
Plot the data on the diagram sequentially as it is collected. The accept or reject decision is made when sample data plots on or over an acceptance line or rejection line. The stair step pattern is caused by the discrete nature of the sample size and the number of defectives in the ntable upon which this diagram is based.
Slope and Intercept of Sequential Lines for Count Data
This report provides the slope and intercepts of the parallel acceptance and rejection lines of the sequential sampling plan who's occurve matches that of the fixedn curve shown.
Performance Curve Tables by Pa  Matched Fixedn & Sequential
The left column (Pa) has constant stepsize.
Performance Curve Tables by c'  Matched Fixedn & Sequential
The left column (c') has constant stepsize. This table was used to build the four MS Excel charts below (OC, AOQ, ASN, and ARL)
Operating Characteristic Curve Graph for Count Data (text)
In most cases, this text graph is sufficient to evaluate and/or compare sampling plans.
OCCurve from TP105 Displayed as MS Excel Chart for Count Data
This chart was made with the MS Excel chart wizard after writing the TP105 performance table to a file, importing it into Excel, and using [data][text to columns] in Excel to parse the tabular data into columns. This procedure has been tested with Excel 5.0 and 7.0(7.0 is office 95)
AOQCurve from TP105 Displayed as MS Excel Chart for Count Data
This AOQ curve is based on AOQ = Pa * c'. It is not adjusted for lot size.
ASNCurve from TP105 Displayed as MS Excel Chart for Count Data
The ASNCurve is useful to estimate the sample size that will be required by a sequential sampling plan for various lot mean defects per sample.
ARLCurve from TP105 Displayed as MS Excel Chart for Count Data
The ARL is the average number of lot acceptances (a run) before a lot is rejected. You want a high ARL at the producer's point and a low ARL at the consumer's point.