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Negative Values on Cgk and Var % (Repeat-ability and Bias) Type 1 Gage Study

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  • April 23, 2020 at 11:51 am #247296

    ronbol
    Participant

    Hi All,

    I am very new to the Type 1 gage studies and have read lots of documentation around the internet.

    With regards to Cgk the benchmark seems to be greater > than 1.33 is acceptable which is clear.

    Now with regards to Var% the normal  that everyone seems to suggest is less than 15%

    I currently have a set of values which display negative values for Cgk and Var% (Repeat-ability and Bias) , how do you interpret these negative values especially on the Var%.?

    Clearly there is significant Bias as the P-Value is 0

    actual values are Cgk -2.33 and VAr% R&B = -9.11

    Can anyone offer any advice?

    Regards

    Dan

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    April 24, 2020 at 12:24 am #247338

    Strayer
    ★ 10 Years ★
    Participant

    Negative values indicate that the gage is biased to measure low.  This article may be helpful. https://mei.org.uk/files/pdf/Mathematics_of_Measurement_Systems_Analysis.pdf

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