The Futon Critic has a story that takes a look at new series launches since 1999 and measures success based on whether the show makes it to a second season.
Of the 100 shows that have launched on Friday night since the fall of 1999, only 15 - or just 15% - have made it to second seasons. Conversely, of the 69 shows that have bowed on Sunday nights during the same period - a whopping 28 (or 41%) made it to second seasons.
Notably, it appears that out of 23 shows FOX has launched on Fridays in that time period, Dollhouse is the only show that launched on Friday to get a second season. With just a 4 percent success rate, FOX is the worst of the broadcast networks (excluding extinct networks like UPN) when it comes to success with Friday launches.
Not surprisingly, CBS has had the best success rate on Fridays with 30 percent.
Check out the whole list, for every network and every day of the week on The Futon Critic.