As a subject matter expert in mathematics and statistics, I can tell you that calculating the sigma, which is a measure of the dispersion or variability in a set of data, typically involves the following steps:


1. Determine the Mean: Calculate the average value of the data set, which is the sum of all data points divided by the number of points.


2. Find the Deviations: For each data point, subtract the mean from the data point to find the deviation from the mean.


3. Square the Deviations: Square each deviation to remove negative values and emphasize larger deviations.


4. Sum the Squared Deviations: Add up all the squared deviations.


5. Divide by Degrees of Freedom: For a sample, the sigma (standard deviation) is calculated by dividing the sum of squared deviations by the degrees of freedom, which is typically the number of data points minus one (n - 1).


6. Take the Square Root: Finally, take the square root of the result from step 5 to find the sigma, which is the standard deviation of the data set.

Here's the process in English, followed by the translation in Chinese:

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Here is the five-step process to calculate your process sigma.Step 1: Define Your Opportunities. An opportunity is the lowest defect noticeable by a customer. ... Step 2: Define Your Defects. ... Step 3: Measure Your Opportunities and Defects. ... Step 4: Calculate Your Yield. ... Step 5: Look Up Process Sigma.read more >>