Question on Neighborhood Grades

[Dirk Michael Horn]

Hi all,

I am a new REI who has partnered with an out of state mentor to help guide me to my first flip and rental. I have been reading and consuming BP podcasts and Youtube content. I hear folks mention grades for neighborhoods (i.e A, B, C, etc.) but I was wondering how you determine those grades. Is there an official method or does everyone have their own systems? Thanks for the help!