RandomLogNormal ( location ; scale )

Returns random values from a Log-Normal distribution

Average rating: 4.5 (31 votes) Log in to vote

Jeremy Bante

https://github.com/jbante/

Sample input:

List (
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 );
RandomLogNormal ( 1 ; 1 )
)

Sample output:

3.560444030529002614726
1.676854304229000419699
2.15979934072772826644
9.95739412580743137696
2.18866193130488630121
3.85046532591213431419
3.333895424562755630169
1.733309970144620521751
3.68126837067318961921
1.88571385204021183882

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/**
 * =====================================
 * RandomLogNormal ( location ; scale )
 *
 * RETURNS:
 *		A number representing a random variate from a log-normal distribution
 *		with the specified parameters.
 *
 * PARAMETERS:
 *		location: The mean of the distribution's logarithm
 *		scale: The standard deviation of the distribution's logarithm
 *
 * DEPENDENCIES:
 *		RandomStandardNormal
 *
 * HISTORY:
 *		CREATED on 2011-10-04 by Jeremy Bante <http://scr.im/jbante>.
 *
 * REFERENCES:
 *		http://en.wikipedia.org/wiki/Log-normal_distribution
 * =====================================
 */

Exp ( location + scale * RandomStandardNormal )

When called repeatedly, RandomLogNormal creates values consistent with a Log-Normal random variable.

This function is dependent on the RandomStandardNormal function.

Comments

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

RandomLogNormal ( location ; scale )

Comments

Support this website.

Support this website.