# Probability Distribution not included in UQLab **URL:** \ **Category:** Community Q&A and How To\ **Tags:** input, reliability\ **Created:** [July 7, 2022, 10:37am UTC](https://uqworld.org/t/probability-distribution-not-included-in-uqlab/1659 "2022-07-07T10:37:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Judah](https://uqworld.org/letter_avatar_proxy/v4/letter/j/90db22/32.png) [@Judah](https://uqworld.org/u/Judah)\ **Post date:** [July 7, 2022, 10:37am UTC](https://uqworld.org/t/probability-distribution-not-included-in-uqlab/1659/1 "2022-07-07T10:37:13Z")
Hi, I am Judah. Currently facing a challenge with my data. After using the plotting too in Matlab, it is clear that my data is a fretchet distribution as its K value is less than 0. I would like to know how to input a distribution type **(fretchet or GEV)** that is not included in UQLab given its parameters. ---
**Author:** ![styfen.schaer](https://uqworld.org/user_avatar/uqworld.org/styfen.schaer/32/849_2.png) [@styfen.schaer](https://uqworld.org/u/styfen.schaer)\ **Post date:** [July 7, 2022, 1:20pm UTC](https://uqworld.org/t/probability-distribution-not-included-in-uqlab/1659/2 "2022-07-07T13:20:51Z")
Dear @Judah In the manual on inputs there is a separate section on how to create and use your own distributions. See section 2.7: > **[UQLab - Probabilistic input modeling user manual](https://www.uqlab.com/input-user-manual)** > > User manual for the probabilistic input modeling module of UQLab. I hope this answers your questions. Best regards Styfen ---
**Author:** ![Judah](https://uqworld.org/letter_avatar_proxy/v4/letter/j/90db22/32.png) [@Judah](https://uqworld.org/u/Judah)\ **Post date:** [July 7, 2022, 1:46pm UTC](https://uqworld.org/t/probability-distribution-not-included-in-uqlab/1659/3 "2022-07-07T13:46:02Z")
Thank you this really helps