# Calculating Z value.

Six Sigma – iSixSigma Forums Old Forums General Calculating Z value.

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• #44948

Brijesh Mishra
Participant

Dear Friends,  I am working on a six sigma project.  The project is to reduced rejection rate.  I took data of last 3 months.  The percent vale of rejection rate is 25%.  At present we don’t have an upper or lower limit.  I have got Mean and SD.  How to calculate Z (Sigma Value)

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#145126

Zephyr
Member

Mikel Harry’s Z equation is meaningless.  There’s plenty to read on this.
Forget it !!!!

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#145128

Green Belt
Participant

Try this old thread where Statman tears Mikel Harry’s friend Reigle to pieces on this topic:
https://www.isixsigma.com/forum/showmessage.asp?messageID=37020

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#145129

sachin shukla
Member

hi,
i am also doing a six sigma project ur specification is one-sided i.e. on rejection rate so it is better to first check normality of the data of population which in ur case is 3 months if data u find it normal then use formula x-mu/ s.d where x is the tarhet value of rejection.

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