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Statistical Significance

Six Sigma – iSixSigma Forums Old Forums General Statistical Significance

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  • #32611

    Sergei
    Member

    SS Friends
    How do you define statistical significance? Do you need a value to establish such siginificance? How about high statistical significance?
    It appears that people with different training see or understand the mentioned concept very differently.
    Your time and knowledge are always appreciated
    sape
     
     

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    #87306

    Marz
    Participant

    Sergei,
    My company uses an alpha risk that is less than .05% as being statistically significant.

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    #87488

    Richard Kelbaugh
    Member

    Statistical Significance is associated with inferential statististics, and is defined as being able to see evidence of difference at the accepted risk for a given hypothesis test.  In the case of the prior message, with and alpha = .05, that would mean that you can see the difference and be 95% confident of your decision. While the 5% risk level is often used by default, risk levels should reflect the criticality of the process test and your willingness to decide something is defferent when it is really not different (a cost to your company). With an XBar control chart we generally test to slightly over 99% confidence.

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    #87528

    Kaushik Bhattacharya
    Participant

    Statistical significance is also very important in Model building using Linear Regression Method. Minitab gives Option to the user to set the value for Confidence (1- alpha).

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    #87553

    shobhamurali
    Member

    Systat also gives the option

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