APBRmetrics

I was interested in looking at defensive impact with a focus on which players protect the paint the best. So i decided to look at two variables DRPM for a general look at players defensive impact, which i got from Espn.com. And then i used the sportsvu data to look at Opponets FGP at Rim.

When looking at the DRPM i only looked at players who had a positive value. And for Opponents FGP at Rim, to restrict the sample to "big men" I made a minimum of atleast 6 FGA at the Rim per game. I standarized both values. Then multiplied all values of Opponets FGP at the Rim by -1, because having a lower Opp FGP is desirable (negative relationship). While having a higher DRPM is desirable (positive relationship). Finally added both values to come up with a final def statistic to measure defensive impact which I called, totaldef.

Player DRPM OPP_FGP_at_Rim totaldef
Rudy Gobert 1.260084448 2.661990692 3.922075141
Andrew Bogut 1.844112879 1.850187111 3.69429999
Serge Ibaka 1.516487174 2.120788305 3.637275479
Tim Duncan 2.278573054 0.718582118 2.997155171
Draymond Green1.851235177 0.767782335 2.619017512
Roy Hibbert 0.683178315 1.899387328 2.582565643
DeMarcus Cousins1.381163513 0.52178125 1.902944763
Larry Sanders 0.725912103 0.718582118 1.444494221
Anthony Davis 1.28857364 -0.314622441 0.973951199
Dwight Howard -0.007684585 0.816982552 0.809297967
DeAndre Jordan 0.761523593 -0.019421138 0.742102454
Andre Drummond0.512243165 -0.117821572 0.394421592
Robin Lopez 0.006560011 0.251180056 0.257740067
Steven Adams -0.221353523 0.275780164 0.054426641
Marcin Gortat -0.178619735 0.078979296 -0.099640439
Tyson Chandler 0.505120867 -0.65902396 -0.153903093
Joakim Noah 0.80425738 -0.978825371 -0.174567991
Tyler Zeller -0.691425187 0.374180598 -0.317244588
Nerlens Noel -0.492000844 0.128179513 -0.363821331
Brook Lopez -1.033295488 0.595581575 -0.437713913
Timofey Mozgov -0.492000844 0.029779079 -0.462221766
Amar'e Stoudemire-0.598835313 -0.068621355 -0.667456669
Amir Johnson -0.199986629 -0.536023418 -0.736010047
Marc Gasol -0.456389355 -0.314622441 -0.771011796
Derrick Favors -0.876604933 0.103579404 -0.773025529
Mason Plumlee -0.427900163 -0.536023418 -0.963923581
Alex Len 0.120516778 -1.126426023 -1.005909244
Pau Gasol -1.346676597 0.103579404 -1.243097193
Omer Asik -1.083151573 -0.216222007 -1.29937358
Paul Millsap 0.348430312 -1.790628953 -1.442198641
Timofey Mozgov -1.360921193 -0.142421681 -1.503342874
LaMarcus Aldridge-1.02617319 -0.486823201 -1.51299639
Channing Frye -0.897971827 -0.683624069 -1.581595896
Jared Sullinger -0.883727231 -0.757424394 -1.641151625
Al Horford -0.940705615 -0.929625154 -1.870330769
Nikola Vucevic -0.570346122 -1.446227434 -2.016573555
Miles Plumlee -0.848115741 -1.421627325 -2.269743066
Anderson Varejao-1.254086724 -1.470827542 -2.724914266

I've attached the final excel document with the ranks, some interesting stuff. Golbert being at the top with other top rim defenders following him Bogut, Ibaka, etc.

This is my first time posting and I am pretty new to this stuff. Would love any pointers or comments. Let me know what you guys think! Thanks.

Can you attach documents to posts? My data was pretty messy when I just copied and pasted and when i tried to allign collumns it all just got messed up.

Hi, welcome. The sum is interesting for a rough two approach rating estimate but the difference is probably worth seeing too. DRPM of course includes rim protection so essentially the sum of the metric zscores double weights that aspect of defensive relative to all the rest.

One decimal place is enough for this data.

http://www.sensefulsolutions.com/2010/1 ... e.html?m=1 has been suggested for formatting assist (not my strength).

Ah I didn't know DRPM took into account rim protection. And just curious what would the differences between the variables show?

Defensive impact from other than rim protection, so the difference would be from perimeter shot defense, steals, defensive rebounding and fouls given and difference between your rim protection value and what DRPM implicitly thinks it is. DRPM theoretically captures the value of at the rim shots deterred, whereas your rating doesn't right now. Hypothetically you could look at dif. in at the rim shots actual vs expected to close gap but RPM is actual game based rather than this season based estimate.

Ok cool very interesting, thanks.