Six Sigma- Mathematical View

It is a statistical measurement technique. Six sigma is a result oriented project driven methodology. In 1980 , Motorola was the first company who implement the six-sigma in their semi-conductor division. Later on GE Electric follows it and their huge success open the door for six sigma implementation in other companies. Today, there are many companies who are adopting the six-sigma in their operation and projects.What is Sigma? In statistics, Sigma is used to calculate the deviation. Six sigma implies for 3.4 PPM opportunities. PPM is stands for Parts Per Million.More sigma means more precision in quality. It begins with 3-Sigma and ends with 6-sigma.Is 6-sigma applicable for only manufacturing sector? Answer is NO. Any type of industry can use and implement it.How anyone can measure their performance in terms of six-sigma? In this methodology , process performance is reported as a sigma level. For measuring the process capability and process performance in statistics, we use Cp, Cpk, Pp, Ppk.What are these Cp, Cpk, Pp, Ppk? Answer is- Cp- it is process capability , Cpk is for process capability index, Pp is for process performance and Ppk is for process performance index.What is the difference between Cp & Pp?The difference between Cp & Pp is that the 6-sigma used for the Cp calculation comes from the estimate of sigma based on average range and in Pp the estimations done by using all the data and classical formula for the standard deviation.Which one is better Cpk or Ppk?Both are important. Cpk can be used for short term, whereas, Ppk can be used for long term.Conclusion- More sigma indicates more precision. That’s why six sigma becomes a demanding object in this competitive era.Keep reading , I will be back with another topic………………………..