The thing is, the parser uses the combat log to look for activity (actions you perform or actions done against you), since neither of these things can happen while dead, death will decrease your presence, unless you are rezzed later.

To quote from the WWS site:

"Hi,

If you read french i advise you to read directly the post made by lossendil at : http://www.lossendil.com/forum/viewtopi ... =3788#3788

For all others i'll traduce it :

Presence is dependent on arrival and leaving time, minus afks that
are counted only if the player is not dead and raid is active at the
moment.

A dead player in fight will not see it's presence decrease if he's
resurected later. if the raid take 10minutes to attrib loots no afk
will be counted." (SoaD)

Basically Presence was originally intended to be a measure of raid attendence, to track afks, etc. The problem (as admitted several times by Lossendil) is that they only have log activity to base it off of. This would allow someone who is afk to show up as present because the received a buff, regened mana from a shammy of spriest, got hit by tranquility, etc. Since a player cannot recieve/perform ANY action while dead, they show up with a decreased presence. In other words, it ended up being a better measure of death that attendence. The problem is that the algorithm used only looks for the first and last action a given player was involved in for the current time split, so someone who goes afk or dies in the middle of a fight, but is "active" at the beginning and end, will show up as 100% present. This will possibly change sometime after the new combat log is fixed to show player deaths, as Lossendil simply stated that he intended to update the algorithm "sometime in the future." (Quoted from back in September.)

Parses up: http://wowwebstats.com/eknyyisucfa41

BRING. YOUR. SHADOW. GEAR.

If invites go quick tonight, we should be on RoS by 7:15pm.

RoS dead and loot out by 7:30pm.

Shahraz by 8-pm, dead and loot by 8:15pm.

Council by 8:30.  --> Down these fuckers TONIGHT <--