Spotted Ratings, Tuesday 2/15/11

Another pretty brutal day on broadcast, with only three programs even managing to fall less than 10% away from their prior season average, and only One Tree Hill and V managing to increase from their most recent original.

	A18-49	Share	Lead	Last	LeLa	Comp	HUT	bcShr	Avg	Rank
No Ordinary Family	1.5	4	n/a	0%	n/a	11.3	36	12	-27%	13/15
V	1.9	5	27%	6%	0%	8.5	36	18	0%	3/6
Detroit 1-8-7	1.2	3	-37%	-8%	6%	3.9	34	24	-26%	12/15
NCIS	3.6	10	n/a	-14%	n/a	9.2	36	28	-12%	15/15
NCIS: Los Angeles	3.3	9	-8%	-6%	-14%	7.1	36	32	-4%	10/16
The Good Wife	2.0	6	-39%	-9%	-6%	3.1	34	39	-13%	14/14
The Biggest Loser	2.7	8	n/a	-10%	n/a	8.9	36	23	-14%	7/7
Parenthood	1.9	6	-30%	0%	-10%	3.2	34	37	-10%	11/15
Glee	4.2	12	n/a	-9%	n/a	8.6	36	33	-13%	11/12
Raising Hope	2.2	6	-48%	-19%	-9%	8.6	36	20	-17%	12/13
Traffic Light	1.4	4	-36%	-26%	-19%	8.6	36	14	-26%	2/2
One Tree Hill	0.8	2	n/a	14%	n/a	12.0	36	6	-16%	13/15
Hellcats	0.7	2	-13%	0%	14%	9.7	36	7	-23%	14/15

KEY
A18-49 - From Nielsen. Adults 18-49 rating. Percentage of US TV-owning adults 18-49 watching the program.
Share - From Nielsen. Adults 18-49 share. Percentage of US TV-watching adults 18-49 watching the program.
Lead - Calculation. Percent difference from lead-in program.
Last - Calculation. Percent difference from previous original episode.
LeLa - Caclculation. Percent difference between the show's lead-in and its lead-in for the previous original episode.
Comp - Calculation. Competition. Total rating of all broadcast programs airing against it.
HUT - Calculation. Phrase commonly known as "Households Using TV," but in this case it's actually "Adults 18-49 Using TV." Percentage of US TV-owning adults 18-49 who are watching any TV in that timeslot. A rough approximation based on all ratings/shares in the timeslot. More on this later.
bcShr - Calculation. Broadcast share. Percentage of US national big-5 broadcast TV-watching adults 18-49 watching the program.
Avg - Calculation. Percent difference from the show's average demo for previous original episodes this season.
Rank - Calculation. The rating's rank among the show's original episodes that have aired so far this season.

Will probably develop more disclaimers if this develops further, but the one that jumps out for now is that the stats in blue will be less accurate because for now I'm counting every program as if it maintains that same rating throughout each half-hour of the broadcast. That is almost always not the case in reality.

More Tuesday Spotted Ratings.