# Calculating RTY

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• #24214

gutierrez
Participant

Hi!
I am studing RTY to implant in my company (Embraco-Brazil) and I found two ways to calculate.
One of them is described in the website of iSixSigma. You get the units in minus rework and scrap and divide per units in of each step and after multiply all the throughput yields to get the RTY.
The second one, you add all the scraps and reworks to get the defects and divide per number of units in. You have the DPU and then you use the equation: RTY = exp(-DPU).
My doubt is why the results diverge when the number of DPU increase? What is the most trustful?
I apreciate your interest and I am sorry for my weak English.
Eduardo

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#58062

Theo
Member

Eduardo,
e^(-DPU) is an estimate of RTY which can be calculated exactly through the first method you described.
e^(-DPU) is useful when you wanted to determine RTY for a process that isn’t so clearly delineated as to have seperate steps that can be measured and then multiplied to calculate RTY.  By using e^(-DPU), the Z value can be calculated (sigma level) for a process in which you’re measuring defects.

Hope this helps.
Theo

0
#58064

gutierrez
Participant

Thanks Theo
I think in the beginning I have to use e^(-DPU) in my calculations because I cant´t measure each step of my process. And after I have to adapt the process to count the units in, the rework and the scrap in each step.
Eduardo

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