Edit by Taira:
Raiders need to start providing notice when they are not going to be attending. I've reviewed the attendance since the first week, taking into account join dates for Bamboo and Nova, and have created the following list.
One thing to keep in mind here is that the attendance below is based on five raids, and missing one is the equivalent of missing 20% of five raids (a larger percentage if you joined later).
The names in gray are assistance given; they both have their own guild raids.
Accurate as of 12/25/14.