Portis gets great season-long stats.he's consistently good, but not great..and, he plays in 16 games nearly every season..so you get a consistent, long slow burn from him, vs. a flame on a candle, like Gore or Westbrook...a PPG flop like Westbrook is great for ,what, 6-7 weeks, then he's a game time decision/doubtful type of player the remainder of the season...? give me Portis over Westbrook/Gore every time..
I don't mean to pick on you specifically, but this is an excellent time to examine the conception of consistency and demonstrate the danger of misperception of things such as "Portis is consistent and Westbrook isn't". This isn't an uncommon view by any stretch. The perceptions of certain players are greatly skewed. I intend to demonstrate that Portis, Westbrook, and Gore are essentially equal. I decided to analyze multiple years of data in order to establish an average PPG, and their variance from them by X amount of points. This was a three-step process.First, I took the last four years of data (2005-2008), and sorted the point values. Second, I grouped them by deviation from the mean, so that we'd know how many of the individual games were within a certain range. Third, I split them into hi (meaning good, or above) and lo (meaning bad, or below). Thus, in the chart below, you'll see that Portis had 6 hi and 8 low within 2 points of average. That means he had 8 games from 12.6-14.5, and 6 games from 14.7-16.6. The results were this:
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Portis Westbrook Gore Years 05-08 05-08 05-08total points 817.7 923.1 742.6 games 56 56 59 average PPG 14.6 16.5 12.6 games within 2 points of avg 14(25.00%) 15(26.79%) 13(22.03%) hi 6 5 3 lo 8 10 10 games within 5 points of avg 27(48.21%) 27(48.21%) 30(50.85%) hi 10 11 8 lo 17 16 22 games within 8 points of avg 40(71.43%) 34(60.71%) 40(67.80%) hi 14 13 14 lo 26 21 26 games > 8 pts difference 16(28.57%) 22(39.29%) 19(32.20%) hi 10 10 11 lo 6 12 8 Total games above average 24(42.86%) 23(41.07%) 25(42.37%)Total games below average 32(57.14%) 33(58.93%) 34(57.63%)
The first thing you notice is that Westbrook has a high incidence of flameout games--12 that are 8 points or more below average. However, 6 of these 12 happened in 2008, which skews the results considerably; it's an outlier season (conversely, only 2 of Portis' were in 2008). Likewise, I'll bump Gore up a season so he won't be penalized for his rookie year compared to the others in the prime of their careers. This will provide a more representative look at their careers when things were more equal on an age/situation/injury level. We'll reduce the sample to 3 years, but if I had more than a couple of hours, I would have considered extending it to all seasons instead. Someone else can do the legwork for that.
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Portis Westbrook Gore Years 05-07 05-07 06-08 games 40 42 45 average PPG 14.8 16.8 14.5 games within 2 points of avg 4(10.00%) 12(28.57%) 6(13.33%) hi 0 5 3 lo 4 7 3 games within 5 points of avg 20(50.00%) 25(59.52%) 18(40.00%) hi 8 11 7 lo 12 14 11 games within 8 points of avg 28(70.00%) 30(71.43%) 32(71.11%) hi 10 12 13 lo 18 18 19 games > 8 pts difference 12(30.00%) 12(28.57%) 13(28.89%) hi 8 6 7 lo 4 6 6 Total games above average 18(45.00%) 18(42.86%) 20(44.44%) Total games below average 30(55.00%) 24(57.14%) 25(55.55%)
As you can see, there's virtually no difference between them. In fact, Westbrook has the greatest amount of consistency +/- 5 points of his average PPG. Both Portis and Gore "catch up" to Westbrook in the 5-8 point variance range, as you can see by their ~70% numbers. However, now that we've happened to pick three very similar backs numerically, we should examine some other long-term dominant backs. To keep it contemporary, I'm going to include three other backs with runs of recent success. Looking at the Historical Data Dominator from 05-07, we find this ranking:1. Tomlinson: 1058.60 points2. Johnson: 767.70 points3. Westbrook: 705.30 points4. Jackson: 694.40 points5. James: 626.70 pointsI'll choose Tomlinson--who is truly dominant and an outlier in himself--Jackson and James. I don't consider Larry Johnson because his two years were really looking like the exception more than representative of a career of excellence. FYI, during that time period Portis ranks 8, and Gore 9, after Alexander and Parker. I considered doing them, but I'll run out of space if I add too many. =p Btw, I excluded playoffs.
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Portis Westbrook Gore Tomlinson Jackson JamesYears 05-07 05-07 06-08 05-07 05-07 05-07games 40 42 45 48 43 47average PPG 14.8 16.8 14.5 22.1 (!!) 16.1 13.3games within 2 points of avg 4(10.00%) 12(28.57%) 6(13.33%) 4(8.33%) 7(16.28%) 11(23.40%) hi 0 5 3 1 7 3 lo 4 7 3 3 0 8 games within 5 points of avg 20(50.00%) 25(59.52%) 18(40.00%) 10(20.83%) 20(46.51%) 28(59.57%) hi 8 11 7 3 13 11 lo 12 14 11 7 7 17 games within 8 points of avg 28(70.00%) 30(71.43%) 32(71.11%) 19(39.58%) 28(65.21%) 42(89.36%) hi 10 12 13 7 16 17 lo 18 18 19 12 12 25 games > 8 pts difference 12(30.00%) 12(28.57%) 13(28.89%) 29(60.42%) 15(34.88%) 5(10.64%) hi 8 6 7 13 7 3 lo 4 6 6 16 8 2 Total games above average 18(45.00%) 18(42.86%) 20(44.44%) 20(41.67%) 23(53.49%) 20(42.55%) Total games below average 30(55.00%) 24(57.14%) 25(55.55%) 28(58.33%) 20(46.51%) 27(57.45%)
Here's where we start to see some variance. Tomlinson is such an extreme that he really has no comparison. An amazing 60% of his games are more than 8 points above or below his average--and he's almost equally split. That being said, 8 points below his average is 14.1, which would put him right around an average game for Gore, Portis, and James. In short, Tomlinson was worth owning because even his crappy days were good. He only had 5 outings below 8 fantasy points, which is almost identical to everyone else (Portis 4, Westbrook 6, Gore 6, Jackson 9). James had 10 below 9 points, but his average was significantly lower as it is. Let's take one more factor into account. Let's look at all variances greater than 5 points.
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Portis Westbrook Gore Tomlinson Jackson JamesYears 05-07 05-07 06-08 05-07 05-07 05-07games 40 42 45 48 43 47average PPG 14.8 16.8 14.5 22.1 (!!) 16.1 13.3games within 5 points of avg 20(50.00%) 25(59.52%) 18(40.00%) 10(20.83%) 20(46.51%) 28(59.57%) hi 8 11 7 3 13 11 lo 12 14 11 7 7 17 games > 5 pts difference 20(50.00%) 17(40.48%) 27(60.00%) 38(79.17%) 23(53.49%) 19(40.43%) hi 10 7 13 21 10 9 lo 4 10 14 17 13 10
Now some final rankings:Ranked in order of extreme consistency (>= 2 points of deviation)Westbrook 28.57%James 23.40%Jackson 16.28%Gore 13.33%Portis 10.00%Tomlinson 8.33%Ranked in order of moderate consistency (>= 5 points of deviation)James 59.57%Westbrook 59.52%Portis 50.00%Jackson 46.51%Gore 40.00%Tomlinson 20.83%Ranked in order of rough consistency (>= 8 points of deviation)James 89.36%Westbrook 71.43%Gore 71.11%Portis 70.00%Jackson 65.12%Tomlinson 39.58%Ranked in order of inconsistency (>8 points of deviation)Tomlinson 60.42%Jackson 34.88%Portis 30.00%Gore 28.89%Westbrook 28.57%James 10.64%Voila.Westbrook, for all his struggles last year, has been a very consistent elite back. Even within the 8 point range, Jackson isn't far off the mark. He's only 5% behind, which all things considered isn't too bad, especially because of the 65.12% of his games within 8 points of deviance, he is the ONLY back that has more HI than LO within 8 points of his mean. 16 high and 12 low. This means that although his inconsistency is greater, it frequently works in the owner's favor, not against it. In summary, you can roughly lump Portis, Gore, Westbrook, and Jackson in the same realm of consistency. This suggests that people who are worried about PPG variances are doing so needlessly.ETA: Think I fixed all of my code and cleared up some confusing bits. However, I created this on a 1440x900 desktop. Thus, my apologies if any of you have trouble reading it at lower resolutions.