I need some help in understanding DPMO Vs RTY. Can I relate DPMO toRTY ?. What's the rationale behind this ?. I did some manual calculations on one real cases in Mfg we are working on, this does'nt seem to be true. For my case I did the RTY calculation based on Poisson's
equation & probability of zero defects as e ^(-DPU).How can I calculate RTY based on DPMO data ?.

One of my references states the following table --is this correct ?- & shows a relation between DPMO and RTY as below

DPMO RTY
-----------------------------------------
308,537 69.1%
.
.
233 99.97%
3.4 99.99966 %

JJ