# Difference of Feature Sets

**URL:** <https://forum.numer.ai/t/difference-of-feature-sets/4780>\
**Category:** Tournament\
**Created:** [January 13, 2022, 4:18pm UTC](https://forum.numer.ai/t/difference-of-feature-sets/4780 "2022-01-13T16:18:29Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![dzheng1887](https://avatars.discourse-cdn.com/v4/letter/d/f475e1/32.png) [@dzheng1887](https://forum.numer.ai/u/dzheng1887)\
**Post date:** [January 13, 2022, 4:18pm UTC](https://forum.numer.ai/t/difference-of-feature-sets/4780/1 "2022-01-13T16:18:29Z")

</div>

Hi, can someone help explain the feature\_metadata json file? I was expecting the small feature set to be a subset of the medium, but it doesn’t appear so. If using the full set of data, will there be redundant overlap among different columns that I should try to take care of?

Also, I find these stats in the feature\_metadata. Is there a definition somewhere that lists these out and what they are exactly?  
{‘legacy\_uniqueness’: 0.3646533080939621,  
‘spearman\_corr\_w\_target\_nomi\_20\_mean’: -0.011053228109048541,  
‘spearman\_corr\_w\_target\_nomi\_20\_sharpe’: -0.26929474693604694,  
‘spearman\_corr\_w\_target\_nomi\_20\_reversals’: 0.0008786204121464577,  
‘spearman\_corr\_w\_target\_nomi\_20\_autocorr’: -0.014497012511186493,  
‘spearman\_corr\_w\_target\_nomi\_20\_arl’: 3.984732824427481}

Thanks

---

<div class="post-metadata">

**Author:** ![baslaa](https://avatars.discourse-cdn.com/v4/letter/b/ee7513/32.png) [@baslaa](https://forum.numer.ai/u/baslaa)\
**Post date:** [January 13, 2022, 9:29pm UTC](https://forum.numer.ai/t/difference-of-feature-sets/4780/2 "2022-01-13T21:29:47Z")

</div>

Hey man,

Here’s the post explaining all your questions:  
[October 2021 Updates - Announcements - Numerai Forum](http://forum.numer.ai/t/october-2021-updates/4384)

---

<div class="post-metadata">

**Author:** ![dzheng1887](https://avatars.discourse-cdn.com/v4/letter/d/f475e1/32.png) [@dzheng1887](https://forum.numer.ai/u/dzheng1887)\
**Post date:** [January 13, 2022, 9:51pm UTC](https://forum.numer.ai/t/difference-of-feature-sets/4780/3 "2022-01-13T21:51:48Z")

</div>

Thank you! I’ll check these forums more rigorously for answers in the future