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Unread 24-03-2013, 10:37
Donut Donut is offline
The Arizona Mentor
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FRC #2662 (RoboKrew)
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Re: Alliance Selection Strategy

Quote:
Originally Posted by themccannman View Post
I would just like to note that if you are picking a robot for the sole purpose of offense OPR is the best system you have you don't already have a scouting system. The OPR ranking has a .9 correlation with our teams actual, quantitative offensive ranking of teams (how many points each team actually scores in a match) so when you say OPR isn't accurate at telling you which robots are good offensive bots you are wrong, it is 90% accurate. For your third alliance partner you need to completely ignore OPR and seeded ranking and just look at what robots fit your strategy best, that might be a defensive robot with nothing but a drive train, or it might be a robot that can feed you disks half-court from the feeder station (if you have a aground pick-up) or it might be a bot that can climb for 30 points and stay out of your way for the rest of the match.

TL;DR: a good scouting system is irreplaceable, however OPR does tell you, with 90% accuracy, which robots score the most points consistently (this may not mean they are the best pick though).
Is this always the case, or is it 90% accurate at just the regional you attended? I haven't checked the correlation at the Wisconsin regional, but comparing OPR data to the scouting data we collected on individual robot scoring from Friday shows OPR to be off quite a bit at a quick glance. 4212 was far and away the highest scoring average robot at the regional (by at least a 10 point margin) but was 4th in OPR. We (167) were about the 9th highest average scoring robot at the regional but are 26th in OPR. 1732 was 8th in OPR but I believe was closer to 3rd in actual robot scoring.

Of course, Wisconsin could also be an outlier in its own right as far as OPR correlation. I noticed off hand that the regional tended to be very balanced as far as quality scoring machines were concerned. There was not any clearly dominant scoring team like 987 or 2056 at the regional, instead there were 12 or so top teams that all scored between 40 and 60 points a match on average, then the average slowly dropped down until you had to get probably 24 teams in before teams were averaging less than 20 points a match.
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