Pelvic and lower back position while squatting

[Edantop]

Hey Ripp.

Should I start the Squat with my pelvic in an anterior tilt (with the lower back muscles flexed) or in a posterior tilt (with abs and glutes flexed)?
If the answer is neither; and I need to be in a position between, how Ill know if im in a good position or to much anterior or posterior?
I really dont know how to que my lower back while squatting because I dont know what the result should be.

Thanks.

[Mark Rippetoe]

Starting Strength: Basic Barbell Training, 3rd edition (Current Revision, Paperback) – The Aasgaard Company