# Null Distributions

**URL:** <https://community.mrtrix.org/t/null-distributions/1028>\
**Category:** Uncategorized\
**Created:** [July 13, 2017, 11:49am UTC](https://community.mrtrix.org/t/null-distributions/1028 "2017-07-13T11:49:30Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Antonin\_Skoch](https://community.mrtrix.org/user_avatar/community.mrtrix.org/antonin_skoch/32/358_2.png) [@Antonin\_Skoch](https://community.mrtrix.org/u/Antonin_Skoch)\
**Post date:** [July 16, 2017, 11:46am UTC](https://community.mrtrix.org/t/null-distributions/1028/2 "2017-07-16T11:46:23Z")

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Dear @cbajada,

this thread and therein recommended paper might be helpful for you:

> [@Just iFOD1 and iFOD2 works, FACT not](http://community.mrtrix.org/t/just-ifod1-and-ifod2-works-fact-not/722/9):
>
> Ah sorry, I forgot about that one in my response: The nulldist / nulldist2 algorithms are supposed to be noisy; that’s their defining attribute (“Null Distribution”). I would suggest reading the relevant article that is cited in the tckgen command’s [reference section](http://mrtrix.readthedocs.io/en/latest/reference/commands/tckgen.html#references).

Morris, D. M.; Embleton, K. V. & Parker, G. J. Probabilistic fibre tracking: Differentiation of connections from chance events. NeuroImage, 2008, 42, 1329-1339

Antonin

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