

But should we "discriminate" based on how long your team has been around? If you think about it, FIRST's goal is to inspire students, right? ...But students on rookie and secondyear teams, if anything, are in greater need of being inspired.  LauraN [more] 



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#16




Re: OPR Formula
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#17




Re: OPR Formula
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Occasionally, DPR will take into account nonrandom factors other than the team's robot, though. In 2011, a team's human player could play a significant role in determining opponents score. A human player's output (# of tubes thrown) and accuracy (% of tubes picked up by own alliance) definitely affect opponent score, for example. A human player who threw many tubes or wasn't very accurate could result in a team having a high DPR. In 2012, human players aren't a factor, but hoarding as an alliance strategy certainly is (note that an alliance could control 15 of the 18 balls at a time). A low DPR by a team not playing defence would probably be indicative of such a strategy. 
#18




Re: OPR Formula
I didn't get it from twitter. I got it from the web based results (with a URL like this: http://www2.usfirst.org/2011comp/eve...chresults.html) by just going through all the event codes and putting it as a parameter in an excel query that would get the data from http://www2.usfirst.org/2011comp/events/event_code/matchresults.htm. Then, I just put them all in the table I posted.
To get this data from twitter, you'd have to use the API, and I'm not sure to go about that. Maybe you could fetch tweets using JSON? 
#19




Re: OPR Formula
Hey guys,
I took what all of you have contributed (great post by the way, very helpful) and constructed an excel file to do RUSH's postcompetition analysis, or other competition scouting for states and nationals. So i wrote a macro (not very efficient at those, sorry) and it creates webquery files, obtains the data, and organizes it for however many teams are in the tournament. The only problem I am having is the OPR calculations. Can someone look at my macro and see what they can do about adding an OPR calculation formula or something? Or give me some feedback on how i can improve it cause I really am not too good at these. Thanks. 
#20




Re: OPR Formula
That's along the same lines I was thinking. If you could calculate the opposing score, then you would have your DPR.

#21




Re: OPR Formula
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#22




Re: OPR Formula
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Nice work. If you want your spreadsheet to calculate OPR from the results that you get from the web query, you are welcome to copy any of the macros that I published. I did not put protection on them to allow other teams to use them and customize for their own use. However if that is all you are going to do, I don't see the purpose of it except as a learning process since I publish OPR/CCWM results of every regional and district after each week of competition and I have been doing it for the last 4 years. Please refer to the following white paper. http://www.chiefdelphi.com/media/papers/2174 You will not see the weekly published spreadsheets from prior years since I delete them at the end of the season and only keep the last one. 
#23




Re: OPR Formula
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On my 8yearold computer, it took ½ second to read the file and create the 2052x2052 matrix. It took 19 seconds to factor the matrix and compute OPR, CCWM, and DPR. Last edited by Ether : 01302012 at 08:00 PM. 
#24




Re: OPR Formula
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Last edited by DMetalKong : 01302012 at 08:27 PM. 
#25




Re: OPR Formula
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The numbers you have is slightly different than mine. Do you include elimination round matches? Your 8yearold computer must have been quite a powerful computer 8 years ago. Or is there a solver you used that is faster than the Cholesky Decomposition that I used. Here is the statistics that my son got when he was a junior in his independent study math class. Computer Model HewlettPackard HP ProBook 6555b Platform Mobile OS Version Microsoft Windows XP Professional CPU AMD Turion(tm) II P520 DualCore Processor Memory 2807 MB Here are the data table from tests: (time in seconds) Size GaussJordan method LU Factorization Cholesky Decomposition 100 0 0 0 300 9 1 0 500 46 8 1 750 159 27 4 1000 383 64 11 1400 1056 178 30 1800 2278 384 63 This was the 2010 data and it took 63 seconds on that slow machine. 
#26




Re: OPR Formula
Hi Ed,
The numbers you have is slightly different than mine. Do you include elimination round matches?I used all the data in the "one big file" that Phil attached to post#8 in this thread. That file contains only raw data (no metadata) so I can't say for certain what Phil included. @Phil: Can you jump in here and answer Ed's question? Your 8yearold computer must have been quite a powerful computer 8 years ago.Pentium D 3.4GHz 1GB Or is there a solver you used that is faster than the Cholesky Decomposition that I used.I also used Cholesky, but all Choleskys are not created equal. There are various implementations. Some are columnoriented and some are roworiented; some are inplace and some are not. It makes a difference. The one I used is a slightly modified version of one that I selected sometime back in the late 80s after testing several different algorithms from various texts. It's optimized for memory access. The 19 seconds was for a 2052x2052 matrix using double precision (64 bit) floats for the matrix and Intel extended precision 80bit floats for intermediate calculations. I just reran it with singleprecision (32 bit) floats and it took a little less than 12 seconds to factor the 2052x2052 matrix. 1800 2278 384 63That's 63 seconds for an 1800x1800 matrix. Since Cholesky goes as O^{3}, that would take ~93 seconds for a 2052x2052 matrix. How are you computing the results in the "Worldrank" tab in the Team_2834 2011_Scouting_Database Championship v4 spreadsheet? My version of Excel (2000) only has 256 columns  not enough to hold a 2052x2052 matrix. I assume you are crunching the numbers in some other app? I also computed the OPR & CCWM for the data (qualification matches only) in the link that Tom Line included in his post#4 in this thread. Attached are my results. The columns are Team#, OPR, CCWM, and DPR. If you would run your computation on the same data we could compare apples to apples. 
#27




Re: OPR Formula
You know, I might have actually forgot to put elimination rounds into that file. I forgot that I had to specifically tell excel to import a second table. Attached is a revised version of my entire workbook. Sorry about that, guys.
EDIT: I attached another file that has some more information  regional names, match times, etc Last edited by plnyyanks : 01312012 at 03:22 PM. 
#28




Re: OPR Formula
Understand that in the twitter feed there is a lot of garbage data too. Various test posts as well as practice matches.

#29




Re: OPR Formula
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Columns are Team#, OPR, CCWM, and DPR 
#30




Re: OPR Formula
Ether,
Your republished numbers are very close to mine now. I also used double precision. My implementation is done in Excel using VBA. I do not actually put the 2053 X 2053 matrix inside the spreadsheet so it works in older version. The program read in the match results and assemble the matrix. It is just stored in the memory for the calculation. Solving the equations inside Excel using VBA is probably slower than outside in another app. Tom Line mentioned they are solving the equations using Excel builtin solver. I am curious what algorithm they use and how fast that would be. How come you only have 2052 teams? I have 2053 teams in 2011. Last edited by Ed Law : 01312012 at 03:58 PM. 
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