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kappa test for attributtes, destructive test

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  • #24862

    Arturo
    Participant

    Hi,
    I´m validating  method test in wich the samples are tested at 400 psi by 5 second, the acceptance criteria is accept/fail; i need to know how to evaluate thru kappa test or if exist some aplication tool for this condition
    regards,

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    #59646

    Remi
    Participant

    Hai Arturo.
    Such a test only will divide your products into 2 groups: passed (1) and failed (0). The test is not very good for evaluating your products and process behaviour because you only can analyse groups of samples (how many 0’1 and 1’s you have over time).
    I recommend you to change the test in the following (easy?) way:Put a stress of 400psi on the product and measure the moment of time it fails. Stop the test at t=5 seconds. In this way you will generate a continuous measurement that is right-censored (tmax=5 because after 5 seconds you always stop measuring) . This data can be analysed like Reliability data.
    For a measurement system analysis you have to investigate 2 things: First how well is the setting of 400psi each time a product is tested and Second how accurate your time measurment is.
    Remi

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