How to Calculate Six Sigma
                     How to calculate Six Sigma?
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Six Sigma was invented to improve the manufacturing processes and it aims to improve  
the process output through various techniques which involve removal of errors and  
reduction of variable quotient in business and manufacturing processes. Six Sigma  
levels represent the reliability of the process, higher Six Sigma means the process is  
reliable and working in good condition. Let us assume if Six Sigma level one means 61%  
of the parts produced or service rendered by the process are defective, which further  
means only .00034 percent of the parts are defective. Six Sigma is calculated by the  
number of defects per million opportunities (DPMO). The sigma level provides the  
metrics to understand the capability of the process or an organization to meet the  
customer requirements.
When DPMO is calculated?
 DPMO is calculated in the measure phase of the DMAIC Process, DMAIC Define,  
Measure, Analyze, Improve, and Control. It refers to a data-driven quality strategy  
for improving processes.
 DPMO may be used throughout the DMAIC process as per the questions raised.
 It is calculated to improve the Six Sigma phase.
How to calculate DPMO?
DPMO can be calculated by gathering the information. First we have to collect the data  
for the number of units produced, the number of defect opportunities per unit and the  
number of defects. The below mentioned formula to calculate the number of defects in  
the process per million opportunities;
DPMO is number of Defects x 1,000,000((Number of Defect Opportunities/Unit) x 
 Number of Units)
Let's brief it through the example of Laptop manufacturer who wants to calculate the Six  
Sigma of its manufacturing process. For two months, the manufacturer makes 83,934  
laptops and during the test phase, 3,432 laptops were rejected.
From the above mentioned formula, we get defects = 3432 Opportunities = 83934  
Defect Opportunities per unit = 9 DPMO = 5111.158768 You can use the Six Sigma  
table below to find out the level for respective DPMO value: Six Sigma Level DPMO 1  
690,000 2 308,000 3 66,800 4 6,210 5 320 6 3.4 For the example given above, DPMO  
of 5,111 is less than 6,210 and greater than 320. Hence, it results in a Six Sigma level  
four designation. Six Sigma calculations are all about statistical analysis and report  
generation through which anyone can understand the process flaws and requirements.  
Through the above-mentioned examples, you can calculate Six Sigma to a wider level..
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Resource: https://blog.mindcypress.com/p/how-to-calculate-six-sigma