Sigma Level and PPM Calculation on Excel

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Institute of Quality and Reliability

Күн бұрын

Dear friends, I am glad to release our technical video on the subject of ‘Sigma Level vs Defective Proportion and PPM’! In this video, I have tried to explain the definition of sigma level in the context of relation between tolerance and standard deviation sigma. Sigma Level assessment is an essential step in Six Sigma projects. In this video, I have explained the logic of 1.5sigma shift as was developed in Motorola. The sigma level vs ppm calculations are explained and illustrated using Excel screen recording. Hope you find this video interesting! Kindly share the link with anyone who may be interested in this topic. Click the like button and subscribe to our channel if you find the video interesting and useful!
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Пікірлер: 5

@sundaramsekar1510 7 ай бұрын

Thank You So Much Sir, for your detailed lucid explantion

@uhemant1 7 ай бұрын

Welcome! My pleasure! 🙏

@instituteofqualityandrelia7902 3 ай бұрын

Welcome! My pleasure! 🙏

@730soci 7 ай бұрын

Hi Sir Thanks a lot for detailed explanation One small clarification or request i have is to throw some light on minimum sample size calculation when there is low population For example we are producing only 50 or 100 parts and want to know how many samples are necessary to quantify process capabilities? Suppose we dont have any previous knowledge of the scatter or mean Most of examples show it for success or failure based samples or they show for normal distribution given that we know scatter about process to being with But if we dont havw any details how do we know what number of samples are enough to quantify that

@instituteofqualityandrelia7902 7 ай бұрын

Good question! If you have low sample sizes, say 50-100, you should be ok to calculate Process capability after checking for normal distribution. Basically the standard deviation values stabilize with 40-50+ sample size. If you use Minitab, it shows a confidence interval for Cpk value. Also, for small sample sizes, 1.5 Sigma shift will not apply! Hope this helps.