No, it’s not Déjà vu.Last time, we discussed DRS, a defensive metric that as

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No, its not Dj vu.Last time, we discu sed DRS, a defensive metric that a signs run values to defensive plays and gives players credit based on how valuable each play they made was. This week, were discu sing UZR, a Blake Parker Jersey defensive metric that a signs run values to defensive plays and gives players credit based on how valuable each play they made was.Dont worry, this will make more sense in a bit.STAT TO THE FUTURE: The overlap of UZR/DRSBoth UZR and DRS work principally by determining the probability that a play is made on a batted ball, a signing a run value to a batted ball and giving a player credit or penalizing a player for making or mi sing a play, respectively.For example, if a batted ball is caught 25 percentof the time, and that batted ball is worth 0.6 runs on average, then a defender who makes the play receives 0.6 times (1 - .25) = +.45 runs worth, and if he mi ses it, then he is penalized -.15 runs.Both UZR and DRS use the same dataset, Baseball Info Solutions batted ball data. BIS cla sifies balls based on their quality of contact, spray, elevation and type.Both UZR and DRS also give run credit for different aspects of play,like giving outfielders credit for throwing the ball in to throw out runners or keep runners from advancing, or for turning double plays.Think UZR and DRS as toddlers playing with Legos to build a helicopter:they both use Jason Castro Jersey the same materials and are attempting to accomplish the same goal, but theyre taking different paths to do so.Different strokes for different folksSo why, then, do UZR and DRS disagree so much for these guys?PlayerDRS (2017)UZR (2017)Kyle Seager-26.2Miguel Cabrera-83.3Justin Turner6-1.1UZR grades Seager and Cabrera as above-average defenders in 2017, and Turneras well below average, but DRS says the opposite.Clearly, theres a big disagreement here.There are several factors attributing to the disagreement, but perhaps s the biggest difference is that UZR uses larger buckets than DRS.DRS and UZR perform their calculations by grouping batted balls into buckets similar types of batted balls grouped together. UZRs buckets are larger, so on the back end, theyre le s precise than DRS, but , DRSs data from BIS is not nece sarily precise enough to warrant the size of the buckets that DRS uses,so theres a trade-off with both metrics.So in that respect, its po sible that a batted ball is measured by DRS to be much more valuable than measured by Mitch Garver Jersey UZR, and thus, a player receives le s credit from UZR than they might from DRS.In the long term, these differences even out quite a bit. Here are those same three players as before, but this time Ive displayed their DRS and UZR values over the past three years.PlayerDRS (2015-2017)UZR (2015-2017)Kyle Seager1412.4Miguel Cabrera-106.5Justin Turner1816.1The values for Seager and Turner are much more in concert with each other in regard to DRS and UZR, though Cabrera paints a polarizing picture defensively.Cabreras differences couldbe explained by the fact that DRS calculates the penalties and credits for batted balls that multiple fielders can make a play on differently from UZR.If Glen Perkins Jersey a ball can be fielded by either of two playersand both mi s, DRS punishes those players each more than UZR. If either succeeds, that player receives more credit with DRS than they would with UZR. Because of these and other factors, DRS tends to a sign a greater spread of values than UZR.Among qualified players, the best and worst player in 2017 by DRS differed by 59 DRS, but that figure was only 33.8 for UZR.Cabrera has spent much of the past three seasons sharing the right half of the infield with Ian Kinsler, who has consistently graded out as a stellardefensive second baseman (37 DRS, 20.9 UZR from 2015-2017). Cabrera, with very limited range, might opt to cover the bag and let Kinsler dive after balls in both directions. If Kinsler cant make the play, both are punished more by DRS than UZR,but Kinsler Kirby Puckett Jersey has a better ability to make plays than Cabrera, so he can make up for his shortcomings with those plays.Cabrera can't,as an aging first baseman with limited range, so DRS punishes him more than UZR. Its not the only reason for UZR and DRSs differences, but it's certainlya factor.All in how its usedThe reason that DRS and UZR function separatelylies in the small differences between the twoome sabermetricians prefer the small differences of UZR to the differences of DRS, or vice versa. Its not an objective measurement, where one metric is strictly better than the other, but a matter of preference.UZR and DRS also exist partially to support their respective forms of WAR:UZR is used in calculating fWAR for FanGraphs, whereas DRS is used in calculating rWAR for Baseball Reference. Like calling a carbonated beverage soda in one region or pop in another.Or pronouncing .gif with a hard Gsound or pronouncing it correctly,its just different strokes for different folks.