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 Author Topic:   Duncan's Tables Atul KhandekarForum Contributor Posts: 21From:Pune, IndiaRegistered: Mar 2000 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 Rick GoodsonForum Wizard Posts: 102From:Wuakesha, Wisconsin, USARegistered: Aug 2000 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 Atul KhandekarForum Contributor Posts: 21From:Pune, IndiaRegistered: Mar 2000 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 Rick GoodsonForum Wizard Posts: 102From:Wuakesha, Wisconsin, USARegistered: Aug 2000 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 df ~ (.9)g(m-1). ie: g m table df calc df 6 2 5.5 5.410 3 18.4 18.015 3 27.5 27.010 5 36.5 36.020 7 105.7 108.0Hope that helps.IP: Logged
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