# Documentation/Calc Functions/LOGNORM.INV

LOGNORM.INV

## Category:

Statistical Analysis

## Summary:

Calculates the inverse of the cumulative distribution function for the log-normal distribution.

 Note: This function is identical to LOGINV and was introduced for interoperability with other office suites.

## Syntax:

LOGNORM.INV(Number[; Mean[; StDev]])

## Returns:

Returns a positive real number which is the inverse of the cumulative distribution function for the log-normal distribution.

## Arguments:

Number is a real number between 0 and 1 or a reference to a cell containing that number which is the probability value for which the inverse log-normal distribution is to be calculated.

Mean is a real number or a reference to the cell containing that number which is the mean value of the log-normal distribution.

StDev is a positive real number or a reference to the cell containing that number which is the standard deviation of the log-normal distribution.

• If Number is greater than or equal to 1 or less than or equal to 0 then the function returns an error value.
• If StDev is negative or zero then the function returns an error value.
• If any of the arguments passed is non-numeric or a reference to a cell containing that value then the function returns #VALUE! error.

• It is such that if LOGNORM.DIST(x;m;s;TRUE()) = p then LOGNORM.INV(p;m;s) = x.

## Examples:

Formula Description Returns
=LOGNORM.INV(0.05;-0.5;1.5) The function calculates the inverse of the cumulative distribution function for the log-normal distribution.Here we can check that LOGNORM.DIST(0.051443022632501;-0.5;1.5;TRUE()) gives 0.05. 0.051443022632501
=LOGNORM.INV(1;-0.5;1.5) The function returns an error value since the Number is greater than or equal to 1. Err:502
=LOGNORM.INV(-0.5;-0.5;1.5) The function returns an error value since the Number is less than or equal to 0. Err:502

None

LOGNORM.INV