LOGNORM.INV

• How to use LOGNORM.INV formula?
• Examples of using LOGNORM.INV formula
• LOGNORM.INV formula not working?
• Similar formulas to LOGNORM.INV

Usage

Use the LOGNORM.INV formula with the syntax shown below, it has 3 required parameters:

=LOGNORM.INV(x, mean, standard_deviation)

1. x (required):
   The probability associated with the lognormal distribution. Must be a value between 0 and 1.
2. mean (required):
   The mean of the lognormal distribution. Must be greater than 0.
3. standard_deviation (required):
   The standard deviation of the lognormal distribution. Must be greater than 0.

Examples

Calculating investment returns

Suppose you have an investment portfolio with a mean return of 8% and a standard deviation of 3%. You want to know the return that corresponds to the 95th percentile of the distribution. You can use LOGNORM.INV to calculate this value.

Modeling stock prices

Stock prices often follow a lognormal distribution. You can use LOGNORM.INV to model the price of a stock at a future date based on its current price, mean return, and standard deviation of returns.

Estimating failure rates

In reliability engineering, the lognormal distribution is often used to model the time to failure of a system. LOGNORM.INV can be used to estimate the failure rate corresponding to a given percentile of the distribution.

Common Mistakes

Incorrect argument order

Users may accidentally input the mean as the second argument and the standard deviation as the third argument, causing the formula to return incorrect results. The correct order is to input the value of x first, followed by the mean and standard deviation.

Invalid input data type

Users should ensure that the input values for x, mean, and standard deviation are numeric. Non-numeric values will cause the formula to return an error.

Incorrect mean or standard deviation value

Users should ensure that the mean and standard deviation values are positive. Negative values will cause the formula to return an error.

Incorrectly interpreting the output

The output of LOGNORM.INV is the inverse of the cumulative distribution function of the log-normal distribution. Users should ensure that they interpret the output correctly based on their specific use case and context.

Related Formulas

The following functions are similar to LOGNORM.INV or are often used with it in a formula:

• LOGNORM.DIST

  The LOGNORM.DIST function returns the cumulative distribution function (CDF) of the log-normal distribution, given a value x, a mean and a standard deviation. The log-normal distribution is often used to model values that are inherently positive and have a large range of values. The function is commonly used in financial analysis to model stock returns and in engineering to model the size of particles in a material.

• NORM.INV

  The NORM.INV function returns the inverse of the cumulative normal distribution for a specified mean and standard deviation. It is commonly used in statistical analysis to find the value at which a specified percentage of observations occur below that value.

• NORM.DIST

  The NORM.DIST formula is a statistical function that returns the normal distribution of a specified variable. It is used to determine the probability of a random variable falling within a specified range of values. This function is commonly used in finance and scientific research.

• EXPON.DIST

  The EXPON.DIST function returns the exponential distribution of a specified random variable, x, given a specified lambda, LAMBDA. The exponential distribution is commonly used to model the time between events in a Poisson process. The function returns the probability density function or the cumulative distribution function of the exponential distribution depending on whether the cumulative argument is set to TRUE or FALSE. This function is useful for analyzing reliability data and can be used to determine the probability that a component will fail before a certain time.

Learn More

You can learn more about the LOGNORM.INV Google Sheets function on Google Support.