given the discussion in here, figured some people might be interested in the results of this study:
http://www.fantasypros.com/2010/08/accurac...ults/#more-2900
http://www.fantasypros.com/expert-accuracy-rankings-2009/
http://www.fantasypros.com/about/faq/accuracy-methodology/
We’ve had an overwhelming response to last week’s Accuracy Awards announcement. After being knee deep in data for the past several months, it was awesome to see that other people really care about this topic as much as we do. In light of this, we wanted to share some more of the detail and insights from the study.
Note: If you just want to check out the rank order of how everyone did, you can go to our Accuracy Rankings. If you crave a little more meat and want to see the actual numbers, you can go to our Accuracy Scores. If you’re looking for some bedtime reading, you can take a look at our Methodology.
Key Findings
1. The most accurate expert was between 19% and 31% better than the least accurate expert, depending on the position. RB had the tightest spread while QB had the largest.
2. There were drastically larger spreads when looking at individual weeks. On average, the difference between the best and worst expert was 58% for RB and 182% for TE.
3. When looking purely at whether the expert’s predictions were right or wrong (i.e. with no weighting based on the value of the predictions), the spreads were considerably tighter.
4. The data we’ve pulled together offers a ton of insight beyond just the summary accuracy scores that we’ve published so far.
More Thoughts
1. A lot of experts were bunched together with very little spread in their accuracy scores. This makes sense to us. Similar to sports betting, it’s really difficult for experts to distance themselves from the pack over the long haul. But also similar to sports betting, something as small as a 5% edge can make a huge difference. How many times have you lost by a small margin in your heads up match each week? Just a few points can mean the difference between a win and a loss! A few other takeaways:
* Be wary of sites that claim their advice is 40% more accurate than other sites – especially if they’re making you pay for this advice. It’s especially concerning that some of these sites don’t publish their methodology. If you have a site that claims this and can back it up, we’d love to hear from you and enter you in our 2010 accuracy study.
* Player list size and average fantasy points per position naturally influenced the size of the spreads. We assessed 40 RB and 50 WR spots compared to 20 QB and 15 TE spots. From a “fantasy points per prediction” perspective, QB was the highest and TE was the lowest. These two factors – fewer predictions and more points per prediction – contributed to the relatively larger accuracy differences for the QB position.
2. Similar to sports gambling again (disclaimer: we are not sports gambling site and do not promote this activity in any way, unless you’re with us in Vegas), these “fantasy cappers” can get hot and cold with their picks from week to week. The amount of variance is again related to the number of predictions that we analyze – the more predictions, the smaller the spread. This is evidence that:
* It may not be a good idea to draw hard conclusions from studies that only examine one ranking per year. This is one reason why we chose to focus on weekly rankings (16 weeks of data) vs. draft rankings (1 list per year). In the future, we’re going to track both draft and weekly rankings and keep year-to-year records.
* Despite the fact that the average edge may get smaller and smaller with the more data that we gather, I’m a strong believer that the best experts will rise up over time. Similar to poker, anyone can drag a monster pot or even win a tournament or two, but the guys that can show positive results over millions of hands are the true experts.
3. On a Win % basis, where we just calculate how often the expert was right, the spread between the best and worst expert was only 14% to 19% depending on position. We don’t use Win % as our final accuracy rating because it doesn’t incorporate the value of each prediction. When you pick a guy that scores 15 points more than the other guy, that prediction should be worth more than when you correctly predict something that only nets 1 fantasy point. Also, when looking at these numbers, please keep in mind that:
* We’re not including every possible prediction. We only score the predictions that involve at least some disagreement between the experts. There’s no reason to score the Chris Johnson vs. Kevin Faulk match-up if every expert is picking Chris Johnson. It’s also not a match-up a typical advice seeker would actually seek. So, when you look at the Win %, think of it as the expert’s ability to make the right call on decisions that are actually contemplated by fantasy players. Including all predictions would naturally improve every expert’s Win %.
4. Running this analysis just got us more curious about other insights that our data can provide. We’ll do our best to share more of this cool information as we dig through it. Here are just a few of the questions we’re hoping to answer:
* For each expert, are there certain players that they have pegged much better than other experts? Are there certain players that they just completely missed on?
* Similarly, are there certain players that the expert tended to overvalue or undervalue relative to the other experts?
* Are certain experts more likely to go against the consensus opinion than others? When they do back the underdog, are they correct more often than not?
* Which experts tend to agree or disagree with each other the most?
* When an expert misses badly on a player, does he tend to over correct the next week, or does he stick to his original opinion?
* The list is endless…we’re just getting started!
Please note that these summary numbers refer to the RB, WR, QB, and TE positions only. DST and K were evaluated and the ratings are published, but given the wide differences in league settings for these two positions, I would take the results with a grain of salt. In fact, we did not include these two positions for our Overall Accuracy Awards.
Overall Accuracy Rankings
Based on weighted average of RB, WR, QB, & TE positions
1. Andy Behrens – Yahoo! Sports
2. Pat Fitzmaurice – Pro Football Weekly
3. Brandon Funston – Yahoo! Sports
4. Gregg Rosenthal – Rotoworld
5. David Dodds – FootballGuys
6. Scott Pianowski – Yahoo! Sports
7. Sigmund Bloom – FootballGuys
8. Staff – FantasyFootball.com
9. Brad Evans – Yahoo! Sports
10. R.J. White – FanHouse
11. Erik Kuselias – ESPN
12. Staff – FantasyCafe
13. Scott Engel – RotoExperts
14. Eric Karabell – ESPN
15. Staff – FFToolbox
16. Christopher Harris – ESPN
17. Matthew Berry – ESPN
18. Staff – SI.com
19. Staff – CBS Sports
20. Staff – KFFL
21. Paul Greco – FantasyPros911
Top RB Experts
RB Accuracy Rankings
1. David Dodds – FootballGuys
2. Sigmund Bloom – FootballGuys
3. R.J. White – FanHouse
4. Pat Fitzmaurice – Pro Football Weekly
5. Erik Kuselias – ESPN
6. Andy Behrens – Yahoo! Sports
7. Matthew Berry – ESPN
8. Staff – FFToolbox
9. Brad Evans – Yahoo! Sports
10. Scott Pianowski – Yahoo! Sports
11. Brandon Funston – Yahoo! Sports
12. Staff – FantasyFootball.com
13. Scott Engel – RotoExperts
14. Staff – FantasyCafe
15. Eric Karabell – ESPN
16. Gregg Rosenthal – Rotoworld
17. Christopher Harris – ESPN
18. Staff – CBS Sports
19. Staff – KFFL
20. Paul Greco – FantasyPros911
21. Staff – SI.com
Top WR Experts
WR Accuracy Rankings
1. Brandon Funston – Yahoo! Sports
2. Gregg Rosenthal – Rotoworld
3. Pat Fitzmaurice – Pro Football Weekly
4. Andy Behrens – Yahoo! Sports
5. Scott Pianowski – Yahoo! Sports
6. Christopher Harris – ESPN
7. Sigmund Bloom – FootballGuys
8. Staff – FantasyFootball.com
9. Erik Kuselias – ESPN
10. David Dodds – FootballGuys
11. Scott Engel – RotoExperts
12. Brad Evans – Yahoo! Sports
13. Staff – FantasyCafe
14. Eric Karabell – ESPN
15. Matthew Berry – ESPN
16. R.J. White – FanHouse
17. Staff – SI.com
18. Staff – FFToolbox.com
19. Staff – KFFL
20. Staff – CBS Sports
21. Paul Greco – FantasyPros911
Top QB Experts
QB Accuracy Rankings
1. Brandon Funston – Yahoo! Sports
2. Andy Behrens – Yahoo! Sports
3. Scott Pianowski – Yahoo! Sports
4. Gregg Rosenthal – Rotoworld
5. Staff – FantasyFootball.com
6. Pat Fitzmaurice – Pro Football Weekly
7. Staff – FantasyCafe
8. Staff – FFToolbox
9. Eric Karabell – ESPN
10. David Dodds – FootballGuys
11. Brad Evans – Yahoo! Sports
12. Erik Kuselias – ESPN
13. Christopher Harris – ESPN
14. Matthew Berry – ESPN
15. Sigmund Bloom – FootballGuys
16. R.J. White – FanHouse
17. Staff – WhatIfSports
18. Scott Engel – RotoExperts
19. Paul Greco – FantasyPros911
20. Staff – CBS Sports
21. Staff – KFFL
22. Staff – SI.com
Top TE Experts
TE Accuracy Rankings
1. Gregg Rosenthal – Rotoworld
2. Staff – FFToolbox
3. Eric Karabell – ESPN
4. Scott Engel – RotoExperts
5. Brad Evans – Yahoo! Sports
6. Andy Behrens – Yahoo! Sports
7. Staff – FantasyCafe
8. Scott Pianowski – Yahoo! Sports
9. Staff – FantasyFootball.com
10. R.J. White – FanHouse
11. Pat Fitzmaurice – Pro Football Weekly
12. Staff – SI.com
13. Christopher Harris – ESPN
14. Brandon Funston – Yahoo! Sports
15. David Dodds – FootballGuys
16. Paul Greco – FantasyPros911
17. Matthew Berry – ESPN
18. Sigmund Bloom – FootballGuys
19. Erik Kuselias – ESPN
20. Staff – WhatIfSports
21. Staff – CBS Sports
22. Staff – KFFL
Top DST Experts
DST Accuracy Rankings
1. Brandon Funston – Yahoo! Sports
2. Scott Pianowski – Yahoo! Sports
3. Brad Evans – Yahoo! Sports
4. Matthew Berry – ESPN
5. Andy Behrens – Yahoo!
6. Erik Kuselias – ESPN
7. R.J. White – FanHouse
8. Eric Karabell – ESPN
9. Staff – CBS Sports
10. Paul Greco – FantasyPros911
11. Gregg Rosenthal – Rotoworld
12. Pat Fitzmaurice – Pro Football Weekly
13. Staff – SI.com
14. Staff – WhatIfSports
15. Staff – KFFL
16. Staff – FantasyFootball.com
17. David Dodds – FootballGuys
18. Christopher Harris – ESPN
19. Staff – FantasyCafe
K Accuracy Rankings
1. Pat Fitzmaurice – Pro Football Weekly
2. Scott Pianowski – Yahoo! Sports
3. David Dodds – FootballGuys
4. Staff – FFToolbox
5. Staff – FantasyFootball.com
6. Erik Kuselias – ESPN
7. Brandon Funston – Yahoo.com
8. Staff – FantasyCafe
9. Staff – SI.com
10. R.J. White – FanHouse
11. Brad Evans – Yahoo! Sports
12. Andy Behrens – Yahoo! Sports
13. Gregg Rosenthal – Rotoworld
14. Christopher Harris – ESPN
15. Eric Karabell – ESPN
16. Matthew Berry – ESPN
17. Paul Greco – FantasyPros911
18. Staff – CBS Sports
19. Staff – KFFL
20. Staff – WhatIfSports
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