iSixSigma

Psuedosigma

Six Sigma – iSixSigma Forums Old Forums General Psuedosigma

Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • #47823

    Terry
    Member

    Can anyone explain the 1.349 in Tukey’s psuedosigma?

    0
    #159902

    Terry
    Member

    Oops! I meant pseudosigma :-)

    0
    #159903

    Bower Chiel
    Participant

    Hi TerryThe quartiles of a normal distribution are: -Mean – 0.67449*Sigma and Mean + 0.67449*SigmaSubtraction gives the interquartile range to be: -IQR = 1.34898*SigmaTurning this formula on its head gives; -Sigma = IQR/1.349on rounding off the constant to 3DP. Thus with a sample from a normal distribution you can obtain an estimate of Sigma by dividing the IQR by 1.349.Best WishesBower

    0
    #159904

    Terry
    Member

    Thanks –

    0
Viewing 4 posts - 1 through 4 (of 4 total)

The forum ‘General’ is closed to new topics and replies.