Do TV ratings take into consideration shows that are recorded with DVR's or TiVo's?

Answer 1

TV rating come from the source "Nelson Ratings"
Relson have very strick rules. One of those rules are you MUST install a ratings device on EVERY tv in your home.
It doesnt matter if you have a VCR, ReplayTV or whatever recording device. You have to use THIER equipment.
I once had the chance to become a Nelson person, but had to turn it down since you have to use thier boxes etc.

Answer 2

Nielsen Media Research seems to be making an effort to account for time-shifted content.