List Standard Deviation
Computes the population standard deviation of a list of numbers.
List Standard Deviation measures how spread out a list of numbers is around its average. A small value means the numbers are close to the average; a large one means they vary a lot. Use it to spot unusual values, for example orders far above the usual amount.
Add the action
In the Process Designer toolbox, open Community-Made and pick List Standard Deviation (or type List Standard Deviation in the search box).
Inputs and outputs
| Field | Direction | Type | Required | What to put / what you get |
|---|---|---|---|---|
| List of numbers | Input | List of Number (decimal) | Yes | The numbers. Map a list variable. |
| Standard deviation | Output | Number (decimal) | Yes | The standard deviation. |
Example
| List of numbers | Standard deviation |
|---|---|
[2, 4, 4, 4, 5, 5, 7, 9] | 2 |
[1.5, 2.5, -3] | 2.392116682401221 |
[5] | 0 |
[] | step fails: Input Error: The list of numbers can't be empty ! |
Good to know
- This is the population standard deviation: the sum of squared differences from the average is divided by the number of values (n), not by n โ 1. If you need the sample standard deviation (as in Excel
STDEV.S), multiply the result by the square root of n / (n โ 1). - The standard deviation is the square root of the variance.
Related actions
Creator
Franck, The Productivity Lab