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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.

  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,
     
  2. Miner

    Miner Moderator Staff Member

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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!
     

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