Below is an example of calculating the standard deviation of the stock returns of Apple (Nasdaq: AAPL) over a three-month period. Step 1 : Collect daily data going back over a three-month period.

Example 12.1: Cusum and Standard Deviation Charts See CUSXS in the SAS/QC Sample Library When you are working with subgrouped data, it can be helpful to accompany a cusum chart for means with a ...

Understanding Residual Standard Deviation . Residual standard deviation is a goodness-of-fit measure that can be used to analyze how well a set of data points fit with the actual model. In a ...

Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.

Standard deviation measures how much variation there is in your sample. Here it's moderate for both variables, indicating that most people you surveyed don't veer too much from the averages.

By default, the XRCHART statement estimates the process mean and standard deviation ()from the data, as in the previous example.However, there are applications in which standard values (and ) are ...