Which seo firms produce the most authoritative SEO studies?

[Brand_Psychic]

I'm not talking about conjectures or guesses -- but SEO studies that is actually backed up by hardcore data.

Which SEO firm produces excellent data-driven studies you always trust?

[Alick300]

Hi,

I trust two websites 1>Brian Dean's http://backlinko.com/

2>http://www.matthewwoodward.co.uk/

Thanks

[Roman-Delcarmen]

Completely agree with you

[Martijn_Scheijbeler]

Just two examples that are top of mind currently:

• Pinterest: https://medium.com/@Pinterest_Engineering/demystifying-seo-with-experiments-a183b325cf4c
• Etsy: https://codeascraft.com/2016/10/25/seo-title-tag-optimization/

[NgEF]

Excellent! Any other sites to share?