Functions > Statistics > Probability Distributions > Example: Log Normal Distribution Functions
Example: Log Normal Distribution Functions
1. Use the dgamma function to calculate the probability density for vector x and shape parameter s:
Click to copy this expression
Click to copy this expression
Click to copy this expression
2. Use the pgamma function to calculate the cumulative probability distribution for vector x and shape parameter s:
Click to copy this expression
3. Use the qgamma function to calculate the inverse cumulative probability distribution for vector x/100 and shape parameter s:
Click to copy this expression
The first argument of function qgamma is the probability and must be less than 1, hence the division of x by 100.
4. Use the rgamma function to create a vector of m random numbers having the gamma distribution and shape parameter s:
Click to copy this expression
Click to copy this expression
Recalculating the worksheet causes function rgamma to return a new set of random numbers.
Log Normal Distribution
Was this helpful?