# about radiomic features

**URL:** <https://discourse.slicer.org/t/about-radiomic-features/21694>\
**Category:** Support\
**Tags:** feature\
**Created:** [January 29, 2022, 4:27pm UTC](https://discourse.slicer.org/t/about-radiomic-features/21694 "2022-01-29T16:27:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Drttt](https://avatars.discourse-cdn.com/v4/letter/d/8797f3/32.png) [@Drttt](https://discourse.slicer.org/u/Drttt)\
**Post date:** [January 29, 2022, 4:27pm UTC](https://discourse.slicer.org/t/about-radiomic-features/21694/1 "2022-01-29T16:27:47Z")

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Hello everyone, I have some questions about the definition of radiomic features on offcial website of pyradiomics. here is the sreenshots

 ![1](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/7/e/7e7965634857f32472ffd0bd7860dc024f9d10ff.png)  
I don’t understand what p(i) means. To my understanding, p(i) is group of value of intensity in a bin.but i am not sure. In addtion, I am not very clear about the difference of X(i) and p(i). Maybe I would like a exact example if possible or some detailed references. Thank you very much If someone can help me. looking forward to your reply.