LOGNORMDIST function

Returns the cumulative lognormal distribution of x, where ln(x) is normally distributed with parameters mean and standard_dev. Use this function to analyze data that has been logarithmically transformed.

Syntax

LOGNORMDIST(x,mean,standard_dev)

X     is the value at which to evaluate the function.

Mean     is the mean of ln(x).

Standard_dev     is the standard deviation of ln(x).

Remarks

  • If any argument is nonnumeric, LOGNORMDIST returns the #VALUE! error value.

  • If x ≤ 0 or if standard_dev ≤ 0, LOGNORMDIST returns the #NUM! error value.

  • The equation for the lognormal cumulative distribution function is:

    Equation

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

    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 Formulas tab, in the Formula Auditing group, click the Show Formulas button.

1

2

3

4

A

B

Data

Description

4

Value at which to evaluate the function (x)

3.5

Mean of ln(x)

1.2

Standard deviation of ln(x)

Formula

Description (Result)

=LOGNORMDIST(A2,A3,A4)

Cumulative lognormal distribution at 4 with the terms above (0.039084)

Applies To: Excel 2007



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