AccuPredict Driver Projection Results
NASCAR Xfinity Series
This is a historical results' page analyzing Accupredict's accuracy in driver projections. A novel idea, right? Checking how accurate an experts projections are.
Portland International Raceway
3 races with driver projections are available.
Picked Race Winner? YES 1 out of 3 races (33%)
TOP-10
TOP-20
MID-TIER
LOW-TIER
| Driver | Races | AVG FIN | AVG RNK | RNK +/- | AVG PRJ | PRJ +/- |
|---|---|---|---|---|---|---|
| AJ Allmendinger | 2 | 2.50 | 9.71 | -7.21 | 3.00 | -0.50 |
| Andy Lally | 1 | 17.00 | 17.88 | -0.88 | 23.00 | -6.00 |
| JJ Yeley | 1 | 8.00 | 22.70 | -14.70 | 32.00 | -24.00 |
| Landon Cassill | 1 | 15.00 | 15.60 | -0.60 | 16.00 | -1.00 |
| Ryan Truex | 1 | 27.00 | 14.55 | 12.45 | 11.00 | 16.00 |
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Projection History
Accupredict is my exclusive finish position projection tool for Crew Chief and Owner subscribers, featuring an algorithm developed by research scientist Cliff DeJong. It leverages traditional and loop data statistics, online since the 2012 Daytona 500.
NASCAR CUP SERIES
NASCAR XFINITY SERIES
NASCAR TRUCK SERIES
ACCUPREDICT by Cliff DeJong
How I Calculate Difference (+/-)
Differences are calculated as: Actual Finish minus Projection
Which 'direction' the difference 'moves' is important. A difference that is negative means the driver finished better than projected. A difference that is positive means he finished worse than projected. A zero means Accupredict got the drivers finish position spot on.
Driver was projected to finish 12th. If the difference is calculated using the Absolute Value of the number (the number of positions 'off' without classifying the number positive or negative) then you're getting a range of eight positions. Four of which are worse than the projected finish.
In my experience, differences between +2 to -4 consistently, are the 'sweet spot' for favorable use of a driver based on Accupredicts projection.
When I show the Absolute Value (distance from zero that a number is on the number line, without considering direction. Absolute Value is always a positive number.) value of a number in addition to Real value.
The MEDIAN and the MEAN numbers in the sidebar both use the Absoulte Value of the number difference between Rank/Predicted Finish and Actual Finish. Otherwise, the positive and negative differences cancel each other out and calculate to 0. I show the STANDARD DEVIATION and the FREQUENCY TABLE using both the absolute and real numbers and note there which is being shown.
I've watched over the years, Accupredict is more conservative in projecting a drivers finish and thus has more negative differences. That is, projecting a driver to finish 18th - they finish 14th - resulting in a difference of (ACTUAL - RANK) 14 - 18 = -4. Whereas, the other way around is a +4. To me, knowing that I missed the projection of a driver by 4 spots...and they were 4 spots better, is a lot better than being 4 spots worse. One way I get more points, the other way I get fewer.
Also, the large positive numbers are the result of a 'top-tier' driver ranked in the top-10 being the victim of a wreck, mechanical failure or unfortunate timed caution.
USING ABSOLUTE VALUES
9.13 Mean (Average) number of positions 'off' that the projections were.
8.00 Median (the middle number when all are sorted, descending) number of 'positions off' that the projections were. Median helps account for outliers in the sequence that might skew the Mean with such a small population of data.
7.45 Standard Deviation measures the dispersion of each driver 'positions off' in relationship to the Mean (Average).