January 21, 201115 yr HiI am recently trained on six sigma. I have a doubt on DPMO. Why are we calculating defects per million opprtuinites, why not per 1000 or 1 lakh oppurtunities? what is the significance of 1 million here?
January 21, 201115 yr Dear Pradeep, You can calculate per 100 (percent) or per thousand or per million basis. If we use percent, when defect levels go very low we get inconvenient numbers like 0.01% or 0.023%. By using per million we can manage with numbers above 1 which is more convenient to use and handle. Strictly speaking, it does not matter. You can use others as well. Regards, VK
February 2, 201115 yr Dear Pradeep: joining to answer your question .... The Z table ...is designed on logarthmic scale and it is coming from the equation on yeild. SDF = e - ( to the power of Defects per unit) SDF is probability of getting a defect free unit as first pass yeild. somehow , the scale is granular to e raised to minus six. This is the main reason for 1 million opprtunities projection. Technically speaking , one can attempt to granulate as error per 100 ( %) ; error per thousand opportunities or error per lakh opportunities. Parashuraman
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