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ANOVA GR&R: Minitab vs AIAG MSA (Any difference?)

Discussion in 'Gage R&R and MSA - Measurement Systems Analysis' started by Giovanni, Oct 2, 2017.

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  1. Giovanni

    Giovanni New Member

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    Dears,
    I am trying to understand if there is any difference between the Minitab and MSA AIAG approach towards ANOVA GR&R. In order to do it I have:
    - Populated an Excel file with Measurements Data from the example contained AIAG MSA 4th. edition document and applied the same formulas.
    - Populated Minitab with the same data.
    - Compared the results.

    It looks like data considering interaction are matching while others no.The difference seems to be the F-Ratio which is calculated in a very different way in case of No Interaction. You can e the ORANGE column (Data from AIAG MSA) and the YELLOW table (Data from Minitab Results). It looks like in AIAG the F-Ratio is different since different degrees of freedom are considered.

    Can anybody explain why?




    ANOVA Minitab and AIGA MSA.png

    best Regards and thanks in advance,
     
    Giovanni, Oct 2, 2017
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  2. Miner

    Miner Moderator Staff Member

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    Miner, Oct 2, 2017
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  3. Giovanni

    Giovanni New Member

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    I'm sorry I wasn't noticed about your reply in Elsmar Cove Forum.
    I'll go on there, Thanks a lot!
     
    Giovanni, Oct 2, 2017
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