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 Measurement, Test and Calibration
 Duncan's Tables
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Atul Khandekar Forum Contributor Posts: 21 |
posted 02 October 2000 10:48 AM
   
QS9000 MSA manual referes to "Duncan's Table D3 for d2* ", to look up the degrees of freedom related to No. of parts, operators and trials. (See : Confidence Interval for Average and Range Gage Study) Are these tables available for reference anywhere on the web? Thanx, -Atul. IP: Logged |
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Rick Goodson Forum Wizard Posts: 102 |
posted 02 October 2000 11:29 AM
Is there a reason you can not used the table on Page 29 in the MSA manual? It is straight from Duncan's book, 'Quality Control and Industrial Statistics'. d2* is a modification of d2 that gives weight to the number of samples (subgroups) used to compute R-bar. If more than 20 subgroups are used the factor is almost identical to d2. IP: Logged |
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Atul Khandekar Forum Contributor Posts: 21 |
posted 03 October 2000 02:59 AM
I can't use it because it gives only d2* values and not Degrees of Freedom. I use that table for calculations of R&R though. -Atul. IP: Logged |
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Rick Goodson Forum Wizard Posts: 102 |
posted 03 October 2000 02:20 PM
The table is also available in Ott's Text, "Process Quality Control" ISBN 0-07-047923-2 as table A-11. Unless you need 'absolute' accuracy you can etimate df from the formula ie: g m table df calc df Hope that helps. IP: Logged |
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