# NTFSTDEV

Returns standard deviation of a specified F distribution.

## Syntax

NTFSTDEV(

• N1,
• N2

)

#### Parameters

• N1 is a parameter of the distribution $N_1$ (Positive integer).
• N2 is a parameter of the distribution $N_2\;(>4)$.

## Remarks

The standard deviation of the distribution is given as:

$\left(\frac{2N_2^2(N_1+N_2-2)}{N_1(N_2-2)^2(N_2-4)}\right)^{1/2}$

## Example

• The example may be easier to understand if you copy it to a blank worksheet

How to copy an example

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

Note  Do not select the row or column headers.

Selecting an example from Help

3. Press CTRL+C.
4. In the worksheet, select cell A1, and press CTRL+V.
5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Tools menu, point to Formula Auditing, and then click Formula Auditing Mode.

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A B
Data Description
4 Value of parameter N1
30 Value of parameter N2
Formula Description (Result)
=NTFSTDEV(A2,A3) Standard deviation of the distribution for the terms above