Difference between revisions of "Documentation/How Tos/Calc: LOGNORMDIST function"

Revision as of 08:18, 17 July 2018

LOGNORMDIST

Calculates values for the cumulative distribution function of a lognormal distribution.

Syntax:

LOGNORMDIST(x; μ; σ;)

A variable is lognormally distributed if its natural logarithm is normally distributed. Parameters of the distribution are μ (mean) and σ (standard deviation).

LOGNORMDIST calculates the cumulative density function for a lognormal distribution.

LOGNORMDIST(x; μ; σ;) is equivalent to NORMDIST((LN(x)-μ)/σ; 0; 1; 1); it may also be calculated from

0.5 * ERFC((-LN(x)+μ)/(σ*SQRT(2)))

The function ERFC belongs to the category Add-in.

Example:

LOGNORMDIST(1; 0; 1)

returns 0.5.

Issues:

• In the forthcoming international standard ODFF this function has an extra parameter, allowing calculation of the probability density function as well.

• LOGINV
• NORMDIST
• NORMSDIST
• NORMSINV
• NORMINV
• ERF
• LN
• SQRT

• Statistical functions

• Functions listed alphabetically
• Functions listed by category