LOGNORMDIST

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.

ShowHow to copy an example

  • Create a blank workbook or worksheet.
  • 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
  • Press CTRL+C.
  • In the worksheet, select cell A1, and press CTRL+V.
  • 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.
 
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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 2003