# Process Sigma

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"Process "sigma =
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Rating
ID
pro.Process Sigma
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907da7d3-5fed-11e6-9770-bc764e2038f2

The Process Sigma calculator compute the process sigma of defects based on the observed total number of defects (tD) and the observed total number of opportunities (tO).  Click HERE for Process Yield .

This is based on the formula for number of standard deviations (sigma), where:

sigma = 0.8406 + sqrt(29.37 - (2.221 * log(DPMO)))

where DPMO = (tD/tO)  * 1,000,000
and tD is the total number of defects, and
tO is the total number of opportunities.

### Instructions

Enter the following:

1. (tD) This is the total defects
2. (tO) This is the total opportunities