The Rocscience International Conference 2021 Proceedings are now available. Read Now
 

Search Results

Normal Distribution

The Normal (or Gaussian) distribution is the most common type of probability density function (PDF), and is generally used for probabilistic studies in geotechnical engineering. Unless there is a good reason to use one of the other PDFs available in RocSupport, it is recommended that the user choose the Normal distribution.

For a Normal distribution, about 68% of observations should fall within one standard deviation of the mean, and about 95% of observations should fall within two standard deviations of the mean. Nearly all observations (> 99%) should fall within 3 standard deviations of the mean.

Normal probability density function, showing standard deviation ranges

Normal Probability Density Function

Truncated Normal Distribution

A truncated Normal distribution can be defined by setting the desired minimum and/or maximum values for the variable. For practical purposes, if the minimum and maximum values are at least 3 standard deviations away from the mean, you will obtain a complete normal distribution. If the minimum / maximum values are less than 3 standard deviations away from the mean, the distribution will be visibly truncated.

Account Icon - click here to log in or out of your account Shopping Cart icon Click here to search our site Click here to close Learning Tech Support Documentation Info Chevron Delete Back to Top View More" PDF File Calendar Location Language Fees Video Click here to visit Rocscience's LinkedIn page Click here to visit Rocscience's YouTube page Click here to visit Rocscience's Twitter page Click here to visit Rocscience's Facebook page Click here to visit Rocscience's Instagram page Bookmark Network Scroll down for more Checkmark Download Print Back to top Single User Multiple Users CPillar Dips EX3 RocFall RocPlane RocSupport RocTopple RS2 RS3 RSData RSPile Settle3 Slide2 Slide3 SWedge UnWedge Commercial License Education License Trial License Shop safe & secure Money-back guarantee