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Fantasy Basketball Draft Tip #1: Percentages are not Created Equal.

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Categorized as: Author: Patrick, Fantasy Basketball, Fantasy Basketball Strategy
Posted on: July 24th, 2008

And if you’ve played in a league that uses percentages as a category, you probably know that already. I know it, your little brother knows it, hell your little grandma with the one good hand probably knows it. But – as I’ve experienced – there’s a difference between “knowing” and “knowing during a draft with 15 seconds on the clock and you’re scrambling to make a pick.”

But let me start at the beginning. If you want to win the free throw and field goal shooting percentages, especially in roto leagues, there are two things to watch and they’re about equally important. The first obviously is a player’s actual shooting percentage. The second is the number of shots they take. Since percentages are averaged across an entire fantasy team, players who take more shots on your team are going to have more sway on your team’s percentages.

But, as always, the question is by how much? Here are the top 20 free throw shooters in the league last year, with their actual free throw percentage first , followed by the number of attempts averaged per game, and then their Effective Free Throw” percentage, which is the weighted percentage compared to someone who takes the league average number of free throws per game.

The Best Fantasy FT Shooters in 07/08

Player FT% Att/Gm EFT
Kevin Martin 86.9% 9.5 96.3%
Chauncey Billups 91.8% 5.6 94.8%
Dirk Nowitzki 87.9% 7.1 93.2%
Caron Butler 90.1% 4.5 89.9%
Kobe Bryant 84.0% 9.0 89.7%
Chris Bosh 84.4% 8.3 89.7%
Ben Gordon 90.8% 4.1 89.4%
Kevin Durant 87.3% 5.6 89.3%
Yao Ming 85.0% 7.4 89.2%
Manu Ginobili 86.0% 6.0 88.4%
Ray Allen 90.7% 3.2 87.0%
Jamal Crawford 86.4% 4.8 86.7%
Paul Pierce 84.3% 6.1 86.4%
Steve Nash 90.6% 3.0 86.3%
Chris Paul 85.1% 4.9 85.6%
Danny Granger 85.2% 4.7 85.4%
David West 85.0% 4.6 85.1%
Corey Maggette 81.2% 9.7 84.8%
Brad Miller 84.8% 4.3 84.4%
Jerry Stackhouse 89.2% 2.6 84.2%

If the table above shows anything, it’s that the number of free throws taken has a great effect on a player’s EFT, which you can think of as the percentage of shots he’d have to hit if he averaged the same amount of shots/game as everyone else. Kevin Martin was the league’s most effective free throw shooter last year despite the fact that he “only” shot 87% from the line. The fact that he took 9.5 free throws a game was the reason. Likewise, Kobe at 9 attempts a game and 84% is a better buy for FT% than Ben Gordon, Ray Allen, and Steve Nash, who all averaged around 91% but shot less FTs.

Depending on the cutoff you want to use, either Brent Barry (95%) or Peja Stojakovic (92.9%) had the best actual FT% last year. But neither of these guys cracks the top-20 FT shooters because Barry only averaged 0.6 free throws a game and Peja 1.8. So, if you’re thinking about drafting Peja this year and one of the reasons is because he’s a good FT shooter, I’d recommend writing him a letter first to call him out as a weak European man-child whose cries like the baby his is when he gets hit on the court because it might ruin his new manicure.

Anyway, the Yang to Kevin Martin’s Ying has to be Dwight Howard, who is quietly taking the Shaquille O’Neal approach to fantasy basketball. His 59% from the line isn’t the worst in the league, it’s the fact that he’s doing while averaging close to 11 shots a game. His 32.6% EFT% is a good 12 points worse than Shaq’s, who’s falling apart so fast that it makes the US economy look stable. Howard is still usable in H2H leagues, but he’s quickly becoming such a category killer in roto leagues that I’ll probably avoid him in every league this year.

The Worst Fantasy FT Shooters in 07/08

Player FT% Att/Gm EFT
Dwight Howard 59.0% 10.9 32.6%
Shaquille O’Neal 50.3% 5.5 44.5%
Josh Boone 45.6% 3.1 56.1%
Reggie Evans 46.7% 3.2 56.3%
Emeka Okafor 57.0% 4.6 57.1%
Kwame Brown 40.8% 2.6 57.1%
Ben Wallace 42.6% 2.3 59.9%
Andrew Bogut 58.7% 4.1 60.6%
Eddy Curry 62.3% 5.1 60.6%
Nene Hilario 55.1% 3.1 62.7%
Lebron James 71.2% 10.3 62.7%
Tyson Chandler 59.3% 3.7 62.8%
Kenyon Martin 58.0% 3.0 65.0%
Alonzo Mourning 58.1% 3.0 65.2%
Chris Wilcox 64.5% 4.0 66.2%
Michael Ruffin 39.7% 1.4 66.6%
Tracy Mcgrady 68.4% 5.4 66.7%
Renaldo Balkman 43.2% 1.5 66.9%
Andre Brown 44.9% 1.5 67.3%
Jason Maxiell 63.3% 3.3 67.5%

It’s not exactly a murder’s row of superstars like in the first table, although Lebron James should really do something about his 71% FT percentage. Maybe it’s just me, but I think “The Chosen One” should be able to hit more than 7 out of 10 free throws.

The point is that percentages are something to think about before you get in the heat of the draft: FT shooters in the 80-85% range can be some of the best in the league when they take enough shots. Make a list of ten guys you can target during a draft if it looks like your team is going to going to need either free throw or field goal percentage help.

Field Goal Percentage

Field goal percentage works in much the same way as free throw percentage, only the number of shots players take is more normally distributed and the difference between actual FG% and EFG% isn’t as great. For example, here are the top 10 EFG% last year.

The Best Fantasy FG Shooters in 07/08

Player FG FGA EFG
Amare Stoudemire 59.0% 15.3 60.7%
Dwight Howard 59.9% 11.9 58.3%
Andrew Bynum 63.6% 8.5 57.3%
Carlos Boozer 54.7% 16.0 56.2%
Tyson Chandler 62.3% 7.7 55.5%
Shaquille O’neal 59.3% 9.1 55.2%
Andris Biedrins 62.8% 7.1 55.1%
Kevin Garnett 53.9% 13.9 54.2%
Monta Ellis 53.1% 15.2 53.9%
Pau Gasol 53.4% 13.5 53.4%

And the player with the worst field goal percentage for fantasy purposes last season? That would be Gilbert Arenas, with an EFG% of 38.7%. He was right below Jamal Crawford, Larry Hughes, Stephen Jackson, and Jamaal Tinsley.

For More Info: Effective Free Throw Percentage

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  • T-Time

    Hey guys,

    I really love your Effective Field Goal and Free Throw Percentages, I cant wait to use them to get a leg up in my draft (in particular in order to overcome Lebron’s gross FT%)

    Have you tried to develop a 3PT% version? I’ve made a few attempts using info and equations from some of the sites you’ve linked on the topic but I’m not yet satisfied as my results seem a little screwy.

    In an old article you guys mentioned:

    “Everything written about EFT% also applies to EFG%. However, the range of field goal percentages and the number shots attempted from the field (average of 11.5, std dev of 4.2) varies less than the number of free throws attempted (average of 4.2, std dev of 2.3), so EFG% stays fairly close to the standard FG%”

    Could it be possible that the reverse is true of E3PT%? That the range of 3 point %’s and the number of 3′s attempted varies a great deal and so therefore E3PT% is wildly different from standard FG%??

    Any advice would be great.

    Thanks.

    T

  • http://www.givemetherock.com Patrick

    Hey T, thanks for the comment and complement.

    So, if I understand you, you play in a league that uses three point percentage as a category? If so, then yes, you should be able to calculate an effective three point percentage for every player. And I think you’re right saying that it should vary even more than free throw percentage, because there are some players who take a lot of threes and some who take none.

    To calculate it, first calculate the league average number of threes and league average 3pt percentage for the top 100 three point shooters in the league. I only use the top 100 to get rid of the noise from part time and other players who don’t shoot threes.

    Then, take a player’s 3pt percentage and subtract the league average percentage. Multiply that value by the number of threes a player takes per game divided by the league average numbers of three taken a game. Add that number to the league average 3pt percentage to get a player’s E3pt%.

    Say a guy shoots 3 threes a game at 40% and the league average is 1.5 threes a game at 35%. His E3pt% would be:

    ((40% – 35%) * (3 / 1.5)) + 35% = 45%

    I hope that’s understandable. Good luck!

  • T-Time

    Ahhhhhhhhhhhhhhh

    “I only use the top 100 to get rid of the noise from part time and other players who don’t shoot threes.”

    That’s the key right there I think. Because I had been using everybody the league average figure was wayyyyy too low, distorting the results a bit. For the exact reasons you mentioned about players who don’t shoot 3′s.

    Thanks for the tip Patrick, I’m off to hit up the spreadsheet again.

    T.

  • M-Dawg

    Ive wondered if using the median instead of the average would be better when tackling fantasy hoops. It seems in many categories there are a handful of guys that perform substantially higher than the crowd, and this may skewer the average. Ive checked and there is a significant difference between the median and average in most categories.

    Id appreciate any comments

  • Zach

    Here’s what I’m trying to do and have run into a slight problem. I’m trying to create a spreadsheet based on the 11 categories our fantasy basketball league uses to come up with a composite score for each player in each category that I can total at the end to give me a list of the best players given the scoring of our league. The categories we use are PTs, FG%, FT%, 3ptMade, 3PT%, OREB, DREB, Blocks, Steals, Assists, TO’s. Basically what I have started to do is assign a value between 0-1 for each player for each category based on last years stats. For points it was easy. I used Lebron’s 30ppg as the high water mark and took the remaining top 200 fantasy players in the league and divided their ppg by 100, Lebron being the only one that earned 1 full point. FG% is a little trickier, but I basically followed what you posted above and made minor tweaks to come up with a fairly normal distribution of scores between 0 and 1 for this category. When I come to 3pt% though, I run into a small problem…big men don’t shoot threes, so they do not penalize you for shooting a bad percentage necessarily, but they do not help you either. In the FG% category, I basically assigned the avg. to be worth .5 points, all the way to Stephen Jackson or maybe someone else gaining only .1 points out of a possible 1. The problem is, a guy like Stephen Jackson actually hurts your FG%, whereas Dwight Howard wouldn’t hurt your 3pt%, but the question is how should you rate players that don’t shoot 3′s in regards to 3pt%? Would it be alright to arbitrarily assign them the half a point since, sort of similar to FG%, the players I assigned .5 point to (the players whose FG% mirrored the average) don’t necessarily hurt or help your %’s, or would this throw off the overall composite scores. Just wondering how somebody else may have attacked this similar problem.

  • http://www.givemetherock.com Nels

    Since Patrick is the one who could answer your statistical query, I will simply direct you to Basketball Monster.