# How to get the standard deviation.(Power Automate Desktop)

03/07/2023

Japanese version.

Introduction to how to obtain standard deviation in Power Automate Desktop.

## Robin(for copy and paste)

It can be copied and pasted into Power Automate Desktop.

``````SET NumList TO [5, 10, 30, 100]
Excel.LaunchExcel.LaunchUnderExistingProcess Visible: False Instance=> ExcelInstance
SET RowCounter TO 1
LOOP FOREACH CurrentItem IN NumList
Excel.WriteToExcel.WriteCell Instance: ExcelInstance Value: CurrentItem Column: 1 Row: RowCounter
Variables.IncreaseVariable Value: RowCounter IncrementValue: 1
END
Excel.WriteToExcel.WriteCell Instance: ExcelInstance Value: '=STDEV.P(A1:A' + NumList.Count + ')' Column: 2 Row: 1
Excel.CloseExcel.Close Instance: ExcelInstance
``````

## Flow creation steps

Prepare a list of numbers for which you wish to calculate the standard deviation.

This Flow requires a lot of work using Power Automate Desktop alone, so an Excel sheet is utilized.

Set up an Excel Launch Action and create an empty Excel book.

Create a RowCounter by placing a Set Variable Action and set the initial value to 1.

Loop through List variables with For each.
Specify the List variable as the Value to be iterated.

Set up a Write to Excel worksheet Action in For each.

Set up an Increase variable in For each to count up RowCounter by 1.

Set up a Write to Excel worksheet Action outside of For each

The value to be written is the formula for the STDEV.P function to obtain the standard deviation in Excel.

Retrieving the result of this formula with Read from Excel worksheet Action will take the standard deviation into the variable.

Finally, close the book with Close Excel Action. There is essentially no need to save.

When this flow is executed, the standard deviation is stored in the Variables produced in Read from Excel worksheet Action.

As an example, the following results are obtained when running for %[5, 10, 30, 100]%.

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