iSixSigma

TRIZ

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  • #24918

    Leon Ortega
    Participant

    How do you consider the benefitial to perform an DOE analysis using covariates compare with a regular DOE analysis????

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    #59852

    Kim Niles
    Participant

    Dear Leon:
    Your title would appear to be a mistake, as your DOE question does not appear related to TRIZ.
    Regarding your question, covariates are random variables you treat as concomitants … or in this case other influential variables that also affect the response.  Using DOE, we can deliberately measure the affects of those variables or if we are unable to control them during the experimentation process, we measure them indirectly as measurements of error in our experiment. 
    I’ve never heard of distinctions being made between “covariate DOE” and or “regular DOE analysis”.  I’d be interested in knowing more regarding what brought about your question.   
    Either way, I hope that helps.
    Sincerely,
    KN http://healthcare.isixsigma.com/library/bio/kniles.asp
     

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    #59853

    Kim Niles
    Participant

    Dear Leon:
     
    One more point of clarification more specifically related to your question is that covariates in DOE are uncontrolled variables that influence the response but do not interact with any of the other factors being tested at the time.  Therefore, if they are present during the experiment then they would show as measurements of error.
     
    I hope that helps.
     
    KN http://healthcare.isixsigma.com/library/bio/kniles.asp

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