This was recently brought to my attention: [https://www.bogleheads.org/wiki/Variable\_percentage\_withdrawal](https://www.bogleheads.org/wiki/Variable_percentage_withdrawal)
The one weakness I see here is that it does not account for a spouse.
In my own situation I have a spouse that is 6 years younger and has significant assets of her own. Its a bit of a tricky planning thing on when to pull the trigger on retirement.