Excel allows a user to calculate the standard derivation using the **DSTDEVP** functions. This step by step tutorial will assist all levels of Excel users in calculating the standard deviation for the population.

*Figure 1. The result of the DSTDEVP function*

**Syntax of the DSTDEVP Formula**

The generic formula for the DSTDEVP function is:

**=DSTDEVP(database, field, criteria)**

The parameters of the DSTDEVP function are:

**database**– a database with values for standard deviation**field – an index of column or field name in a database for the value field****criteria**– a table containing conditions. This table must have the same field names as the database.

**Setting up Our Data for the Formula**

Let’s look at the structure of the data we will use. In the range B5:C11, we have the database with columns “State” and “Average Life Expectancy”. In the range B2:B3, we have the criteria. In the cell E3, we want to get the standard deviation for the criteria.

* Figure 2. Data that we will use in the example*

**Calculating the Standard Deviation Using the DSTDEVP Formula**

In our example, we want to calculate the standard deviation of the average life expectancy for Texas. The result will be in the cell E3.

The formula looks like:

**=DSTDEVP(B5:C11, C5, B2:B3)**

The parameter **database **is the range B5:C11. The **field **parameter is the cell C5. We could also put the name (“Average Life Expectancy”) or 2, as the index of the column in the database. The **criteria** parameter is B2:B3.

To apply the DSTDEVP formula, we need to follow these steps:

- Select cell E3 and click on it
- Insert the formula:
`=DSTDEVP(B5:C11, C5, B2:B3)`

- Press enter.

*Figure 3. Using the formula to calculate the standard deviation*

As we can see in Figure 3, the standard deviation for Texas, based on two values in the database is 3. Therefore, the result of the DSTDEVP function in the cell E3 is 3.

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