What does sigma mean in engineering

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Sigma is a mathematical symbol used to represent standard deviation, a measure of variability in a set of data. In engineering, it is often used to measure the performance of a system or process. Sigma is a measure of how well a system or process is performing, and can be used to identify areas for improvement.

The sigma level is a measure of how many standard deviations away from the mean a system or process is operating. A higher sigma level indicates that the system or process is performing better than average. A lower sigma level indicates that the system or process is performing worse than average. A sigma level of 6 is considered excellent, while a sigma level of 3 is considered average.

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Sigma is also used to measure the quality of a product. A higher sigma level indicates a higher quality product. For example, a product with a sigma level of 6 would be considered to be of very high quality, while a product with a sigma level of 3 would be considered to be of average quality.

Sigma is a useful tool for engineers, as it helps to identify areas of improvement in a system or process. By measuring the sigma level, engineers can identify areas of the system or process that need to be improved in order to increase performance and quality. Sigma is also used to measure the performance of a system or process over time, allowing engineers to track progress and identify areas for further improvement.

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