Here is your list of rookie QBs who have gotten significant playing time since 2004:
As you can see, the average rookie quarterback who has gotten significant playing time since 2004 has a QB rating of 72.89, a little more than two points higher than Ryan Tannehill's current QB rating.
The average winning percentage of those teams during the games those QBs started was 0.431, which is just a tad higher than the Dolphins' current winning percentage (0.400).
The key columns here are "Rating Z" and "Win% Z," which indicate how many standard deviations from average the rookie QB's rating falls, as well as how many standard deviations from average the team's winning percentage falls.
A number of 1 or higher in those columns indicates that the value (either QB rating or team winning percentage) falls at least one standard deviation from average, which puts it at the 84th percentile or higher. In other words, a score of 1 or higher makes the value better than at least 84% of the QBs or teams in the sample.
That's the level at which I'd personally call a value "significant" in this (or just about any) sample. In other words, only if the number in the "Rating Z" and "Win% Z" columns is 1 or higher would I call it "especially good."
As you can see, there are only 4 teams of the 27 listed -- 15% -- that have managed to do significantly better than the average team that's started a rookie QB since 2004.
So, the take-home message is this: if you believe this team should be doing significantly better than its record right now, realize that you're expecting the team to function as well as only 15% of teams with rookie QBs have since 2004.
On the other hand, there are 5 teams of the 27 above -- 19% -- that did significantly worse with a rookie quarterback than the Dolphins are doing right now.
So, when we evaluate how the team is doing right now, IMO we should realize that the team is working with a rookie QB, and based on the recent history in the NFL, there is an 85% chance the team won't do significantly better than it is right now under such circumstances.
IMO we should also realize that the team is nowhere near the 19% of teams that performed significantly more poorly than average with a rookie QB. Instead, the team right now is safely among the 81% of teams that did not perform significantly more poorly than average with a rookie QB.
In other words, contrary to popular belief, there is no cause for alarm regarding the talent surrounding Ryan Tannehill right now in my opinion. :)
QB | Rating | Win% | Rating Z | Win% Z |
Ben Roethlisberger | 98 | 1 | 1.80 | 2.74 |
Joe Flacco | 80 | 0.688 | 0.51 | 1.24 |
Matt Ryan | 88 | 0.688 | 1.08 | 1.24 |
Mark Sanchez | 63 | 0.563 | -0.71 | 0.63 |
Russell Wilson | 91 | 0.6 | 1.30 | 0.81 |
Andrew Luck | 77 | 0.6 | 0.29 | 0.81 |
RGIII | 105 | 0.455 | 2.30 | 0.12 |
Cam Newton | 85 | 0.375 | 0.87 | -0.27 |
Andy Dalton | 80 | 0.563 | 0.51 | 0.63 |
Vince Young | 67 | 0.615 | -0.42 | 0.88 |
Sam Bradford | 77 | 0.438 | 0.29 | 0.03 |
Jay Cutler | 89 | 0.4 | 1.15 | -0.15 |
Trent Edwards | 70 | 0.556 | -0.21 | 0.60 |
Kyle Orton | 60 | 0.667 | -0.92 | 1.13 |
Eli Manning | 55 | 0.142 | -1.28 | -1.39 |
Matt Leinart | 74 | 0.364 | 0.08 | -0.32 |
Matt Stafford | 61 | 0.2 | -0.85 | -1.11 |
Josh Freeman | 60 | 0.333 | -0.92 | -0.47 |
Jimmy Clausen | 58 | 0.1 | -1.07 | -1.59 |
Colt McCoy | 75 | 0.25 | 0.15 | -0.87 |
Charlie Frye | 73 | 0.4 | 0.01 | -0.15 |
Alex Smith | 41 | 0.286 | -2.28 | -0.70 |
Bruce Gradkowski | 66 | 0.273 | -0.49 | -0.76 |
Blaine Gabbert | 65 | 0.286 | -0.56 | -0.70 |
Christian Ponder | 70 | 0.2 | -0.21 | -1.11 |
Brandon Weeden | 70 | 0.2 | -0.21 | -1.11 |
Ryan Tannehill | 70 | 0.4 | -0.21 | -0.15 |
AVERAGE | 72.89 | 0.431 | ||
STANDARD DEVIATION | 13.97 | 0.208 |
As you can see, the average rookie quarterback who has gotten significant playing time since 2004 has a QB rating of 72.89, a little more than two points higher than Ryan Tannehill's current QB rating.
The average winning percentage of those teams during the games those QBs started was 0.431, which is just a tad higher than the Dolphins' current winning percentage (0.400).
The key columns here are "Rating Z" and "Win% Z," which indicate how many standard deviations from average the rookie QB's rating falls, as well as how many standard deviations from average the team's winning percentage falls.
A number of 1 or higher in those columns indicates that the value (either QB rating or team winning percentage) falls at least one standard deviation from average, which puts it at the 84th percentile or higher. In other words, a score of 1 or higher makes the value better than at least 84% of the QBs or teams in the sample.
That's the level at which I'd personally call a value "significant" in this (or just about any) sample. In other words, only if the number in the "Rating Z" and "Win% Z" columns is 1 or higher would I call it "especially good."
As you can see, there are only 4 teams of the 27 listed -- 15% -- that have managed to do significantly better than the average team that's started a rookie QB since 2004.
So, the take-home message is this: if you believe this team should be doing significantly better than its record right now, realize that you're expecting the team to function as well as only 15% of teams with rookie QBs have since 2004.
On the other hand, there are 5 teams of the 27 above -- 19% -- that did significantly worse with a rookie quarterback than the Dolphins are doing right now.
So, when we evaluate how the team is doing right now, IMO we should realize that the team is working with a rookie QB, and based on the recent history in the NFL, there is an 85% chance the team won't do significantly better than it is right now under such circumstances.
IMO we should also realize that the team is nowhere near the 19% of teams that performed significantly more poorly than average with a rookie QB. Instead, the team right now is safely among the 81% of teams that did not perform significantly more poorly than average with a rookie QB.
In other words, contrary to popular belief, there is no cause for alarm regarding the talent surrounding Ryan Tannehill right now in my opinion. :)