# STDEV

The `STDEV` function calculates the standard deviation of a set of numbers. It measures the amount of variation or dispersion of a set of values from the average (mean) value. It is commonly used in statistics to determine the spread of a data set. The values can be supplied as individual cells, ranges, or constants.

## Usage

Use the `STDEV` formula with the syntax shown below, it has 1 required parameter and 1 optional parameter:

Parameters:
1. value1 (required):
The first value or range of cells to calculate the standard deviation for.
2. value2, ... (optional):
Additional values or ranges of cells to calculate the standard deviation for. Up to 30 arguments can be supplied.

## Examples

Here are a few example use cases that explain how to use the `STDEV` formula in Google Sheets.

### Calculating the standard deviation of a set of numbers

Suppose you have a set of numbers representing the heights of a group of people. You can use the `STDEV` function to calculate the standard deviation of the heights, which will give you an idea of how spread out the heights are from the average height.

### Comparing the spread of two data sets

You can use the `STDEV` function to compare the spread of two data sets. For example, you may want to compare the spread of heights for two different groups of people to see if they have similar variability.

### Detecting outliers in a data set

The `STDEV` function can be used to identify outliers in a data set. If a value falls more than one standard deviation from the mean, it is considered an outlier.

## Common Mistakes

`STDEV` not working? Here are some common mistakes people make when using the `STDEV` Google Sheets Formula:

### Incorrect range or reference

One common mistake when using the `STDEV` formula is to use an incorrect range or reference. Make sure that the range or reference you are using is correct and includes all the values you want to include in the calculation.

### Using the wrong formula for the population

Another common mistake is to use the `STDEV` formula instead of the `STDEVP` formula when working with an entire population of data. The `STDEVP` formula should be used in this case.

### Using non-numeric values

The `STDEV` formula can only be used with numeric values. If you try to use it with text or other non-numeric values, it will return an error. Make sure that all the values you are using in the calculation are numeric.

The following functions are similar to `STDEV` or are often used with it in a formula:

• `AVERAGE`

The AVERAGE function calculates the average (arithmetic mean) of the values passed to it. It is commonly used to find the average of a range of cells containing numerical data.

• `MEDIAN`

The `MEDIAN` function returns the median (middle) value of a set of numbers. It is commonly used to find the middle value in a range of data points. If the number of data points is even, it returns the average of the two middle values. This function can be useful in statistical analysis and data visualization.

• `MIN`

The `MIN` formula is a statistical function that returns the smallest value in a set of numbers. It is commonly used to find the minimum value from a range of cells or a list of values.

• `MAX`

The `MAX` function returns the maximum value from a range of cells or a set of supplied values. It is commonly used to find the largest value in a dataset.

• `VAR`

The `VAR` formula calculates the variance of a set of numerical values. Variance is a measure of how spread out a set of data is in relation to the mean. This formula is commonly used in statistical analysis to measure the variability or diversity of a dataset.

You can learn more about the `STDEV` Google Sheets function on Google Support.