RS γ γ. * Kevin D. Dayaratna is a doctoral candidate in Mathematical Statistics at the
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1 The Pythgoren Won-Loss Formul nd Hockey: A Sttisticl Justifiction for Using the Clssic Bsebll Formul s n Evlutive Tool in Hockey By Kevin D. Dyrtn nd Steven J. Miller * October 16, 2013 Abstrct Originlly devised for bsebll, the Pythgoren Won-Loss formul estimtes the percentge of gmes tem should hve won t prticulr point in seson. For decdes, this formul hd no mthemticl justifiction. In 2006, Steven Miller provided sttisticl derivtion by mking some heuristic ssumptions bout the distributions of runs scored nd llowed by bsebll tems. We mke similr set of ssumptions bout hockey tems nd show tht the formul is just s pplicble to hockey s it is to bsebll. We hope tht this work spurs reserch in the use of the Pythgoren Won-Loss formul s n evlutive tool for sports outside bsebll. I. Introduction The Pythgoren Won-Loss formul hs been round for decdes. Initilly devised by the well-known bsebll sttisticin Bill Jmes during the erly 1980s, the Pythgoren Won-Loss formul provides the winning percentge (WP) bsebll tem should be expected to hve t prticulr time during seson bsed on its runs scored (RS) nd llowed (RA): RS WP. RS + RA Erly on, Jmes believed the exponent to be two (thus the nme Pythgoren from sum of squres). Empiricl exmintion lter dvised tht 1.8 ws more suitble. For yers, bsebll sttisticins used the Pythgoren Won-Loss formul to predict tem s won-loss record t the end of the seson. Sbermetricins (sttisticl nlysts ffilited with the Society of Americn Bsebll Reserch) lso used the percentge to comment on tem s level of over-performnce/under-performnce s well s the vlue of dding certin plyers to their lineup. Until recently, however, the Pythgoren Won-Loss formul hd been devoid of ny theoreticl justifiction from first principles. Miller (2007) ddressed this issue by ssuming tht RS nd RA follow independent Weibull probbility distributions nd subsequently derived Jmes s formul by computing the probbility tht the runs tem scores exceeds the runs it llows. He * Kevin D. Dyrtn (kevind@mth.umd.edu) is doctorl cndidte in Mthemticl Sttistics t the University of Mrylnd. Steven J. Miller (steven.j.miller@willims.edu) is n Associte Professor of Mthemtics nd Sttistics t Willims College. The second uthor is supported by NSF grnt DMS nd NSF grnt DMS We would like to thnk Eric Fritz for writing Jv script to downlod hockey dt from ESPN.com, Mike Tylor, Hovnnes Abrmyn nd Arnl Dyrtn for proofreding; Armn Ambti for help with the dt; nd Benjmin Kedem for insightful comments. An bridged version of this mnuscript hs been ccepted for publiction by The Hockey Reserch Journl of the Society for Interntionl Hockey Reserch. 1
2 found, s empiricl observtion hd consistently suggested, tht the most suitble vlue of ws indeed pproximtely 1.8. A few reserchers hve pplied Bill Jmes s model to other sports. For exmple, Schtz (2003) pplied the model to footbll nd determined tht n pproprite vlue of is round Oliver (2004) did the sme for bsketbll nd determined tht n pproprite vlue of is round 14. Rosenfeld et l. (2010) drew upon this reserch nd used the Pythgoren Won-Loss formul to predict overtime wins in bsebll, bsketbll, nd footbll. Cochrn nd Blckstock (2009) pplied the Pythgoren Won-Loss formul to hockey, s hve Chris Apple nd Mrc Foster (Apple nd Foster 2002; Foster 2010). Cochrn nd Blckstock used lest squres estimtion to estimte Jmes s model s well s severl modifictions of it. They found tht Jmes s originl Pythgoren Won-Loss formul, with vlue of round 1.927, is just s ccurte s the results produced by more complex models. Few outside of Aln Ryder (hockeynlytics.com), however, hve provided theoreticl verifiction from first principles for pplying the Pythgoren Won-Loss formul to ny sport other thn bsebll. We dd to his efforts here. Specificlly, we mke the sme ssumptions tht Miller (2007) mde for bsebll nd find tht the Pythgoren Won-Loss formul pplies just s well to hockey s it does to bsebll. Our results thus provide theoreticl justifiction for using the Pythgoren Won-Loss formul, initilly intended for bsebll, s n evlutive tool in hockey. Our work is orgnized s follows. We first discuss our model nd estimtion results; in prticulr, we sketch the derivtion of the Pythgoren Won-Loss formul. Afterwrds, we exmine our model s sttisticl vlidity by performing tests of sttisticl independence s well s goodness of fit. Finlly, we conclude by summrizing our findings nd discussing potentil venues of future reserch. II. Model Development In this section, we prove tht if nd re drwn from independent trnslted Weibull distributions then the Pythgoren Won-Loss formul holds. Specificlly, we ssume tht the distribution of the number of gols hockey tem scores nd the number of gols it llows ech follow independent trnslted two-prmeter Weibull distributions with the following probbility density functions: f ( x; f ( y;, ) =, ) = where I ( x > 0.5) nd ( y > 0.5) x ( ) y ( ) 1 1 e e x+ 0.5 y+ 0.5 I ( x > 0.5) I ( y > 0.5) I re indictor vribles tht re equl to 1 if their rguments re greter thn -0.5 nd re zero otherwise. We specificlly trnslted the Weibull densities by fctor of 0.5 to ensure tht our dt (the integer representing the score) is t the center of the bins for our chi-squred goodness of fit tests. Continuous 2
3 distributions re used to fcilitte computtion by trnsforming sums into integrls, nd fcilitte getting simple, closed-form expression such s the Pythgoren formul. Of course, continuous distributions do not truly represent relity s bsebll nd hockey tems only score integrl vlues of points; however, the Weibull is flexible distribution nd by ppropritely choosing its prmeters, it cn fit mny dt sets. Miller (2007) showed the Pythgoren Won-Loss formul cn be derived by computing the probbility tht the number of gols tem scores is greter thn the number of gols it llows. We sketch the rgument below: Pythg_WL = Pr( x > y) x = f ( x;, ) f ( y;, ) dydx = = x Pythg_WL =. + 0 x+ 0.5 y y 1 x ( ) e ( ) e dydx x y x x 1 y 1 ( ) e ( ) e dy 0 dx x x x 1 = ( ) e 1 e dx 0 The men gols scored () nd men gols llowed () for our trnslted Weibull 1 1 densities re: = Γ(1 + ) 0. 5 nd = Γ(1 + ) 0. 5 (Csell nd Berger 2002; Miller 2006). Therefore, fter bit of lgebr: ( + 0.5) ( + 0.5) + ( + 0.5) Pythg_WL =. Mximum likelihood prmeter estimtion of our Weibull densities enbles us to compute these Pythgoren expecttions. III. Dt nd Results We compiled dt (gols scored nd gols llowed) from ESPN.com for ech of the 30 NHL tems over the course of the 2008/09, 2009/10, nd 2010/11 regulr sesons. We estimted our prmeters simultneously vi mximum likelihood estimtion (MLE). We lso performed tests of sttisticl independence s well s goodness of fit tests. Figures 1 through 4 re some representtive plots of the observed dt nd the best fit Weibulls for the 2010/11 seson. The complete plots re vilble from the uthors. We hve chosen the 2011 Stnley Cup chmpions, the Boston Bruins, their opponent, the 3
4 Vncouver Cnucks, the New Jersey Devils (whose 38 wins, 39 losses nd 5 overtime losses mkes them close to n verge tem), nd the Edmonton Oilers, who hd the worst record in 2010/11: Our results from our mximum likelihood estimtion, our computtion of ech of the 30 NHL tem s Pythgoren won loss formul (Pythg_WL), nd our computed difference between the observed number of gmes won nd the expected number of gmes won (Diff), re below: 2008/09 Ntionl Hockey Legue Estern Conference 4
5 Gmes Won Gmes Lost Actul WL Pythg_WL Diff Tem Boston Bruins NJ Devils Wshington Cpitls Crolin Hurricnes Pittsburgh Penguins Phildelphi Flyers Rngers Bufflo Sbres Florid Pnthers Montrel Cndiens Ottw Sentors Atlnt Thrshers Toronto Mple Lefs Islnders Tmp By Lightning /09 Ntionl Hockey Legue Western Conference Gmes Won Gmes Lost Actul WL Pythg_WL Diff Tem Sn Jose Shrks Detroit Red Wings Clgry
6 Flmes Chicgo Blckhwks Vncouver Cnucks Anheim Ducks Columbus Blue Jckets St Louis Blues Minnesot Wild Nshville Predtors Edmonton Oilers Dlls Strs Phoenix Coyotes LA Kings Colordo Avlnche Gmes Won 2009/10 Ntionl Hockey Legue Estern Conference Gmes Lost Actul WL Pythg_WL Diff Tem Wshington Cpitls NJ Devils Bufflo Sbres Pittsburgh Penguins Ottw Sentors Boston Bruins Phildelphi Flyers Montrel
7 Cndiens Rngers Atlnt Thrshers Crolin Hurricnes Tmp By Lightning Islnders Florid Pnthers Toronto Mple Lefs /10 Ntionl Hockey Legue Western Conference Gmes Won Gmes Actul Lost WL Pythg_WL Diff Tem Sn Jose Shrks Chicgo Blckhwks Vncouver Cnucks Phoenix Coyotes Detroit Red Wings LA Kings Nshville Predtors Colordo Avlnche St Louis Blues Clgry Flmes Anheim Ducks
8 Dlls Strs Minnesot Wild Columbus Blue Jckets Edmonton Oilers Gmes Won 2010/11 Ntionl Hockey Legue Estern Conference Gmes Lost Actul WL Pythg_WL Diff Tem Pittsburgh Penguins Wshington Cpitls Phildelphi Flyers Boston Bruins Tmp By Lightning Montrel Cndiens Rngers Bufflo Sbres Crolin Hurricnes NJ Devils Toronto Mple Lefs Atlnt Thrshers Ottw Sentors Florid Pnthers Islnders
9 2010/11 Ntionl Hockey Legue Western Conference Gmes Won Gmes Lost Actul WL Pythg_WL Diff Tem Vncouver Cnucks Sn Jose Shrks Detroit Red Wings Anheim Ducks LA Kings Chicgo Blckhwks Nshville Predtors Phoenix Coyotes Dlls Strs Clgry Flmes Minnesot Wild St Louis Blues Columbus Blue Jckets Colordo Avlnche Edmonton Oilers The mximum likelihood estimted vlue of is lmost lwys slightly bove 2, verging 2.15 for the 2008/09 seson (stndrd devition 0.133), 2.19 for the 2009/10 seson (stndrd devition 0.14), nd 2.10 (stndrd devition 0.144) for the 2010/11 seson, which is resonbly close to the estimtes computed in Cochrn nd Blckstock (2009). Our results lso indicte tht mny of the top tems, including the Wshington Cpitls, NJ Devils, Sn Jose Shrks, nd the Chicgo Blckhwks nd Vncouver Cnucks performed better thn expected over the course of the sesons exmined. In the next two sections, we test the fundmentl ssumptions our model mkes nmely sttisticl independence between gols scored nd gols llowed nd the ppropriteness of the Weibull densities to model our dt. 9
10 IV. Model Testing: Sttisticl Independence of Gols Scored nd Gols Allowed Nively, one would think tht the distributions of gols scored nd gols llowed should be treted s dependent distributions. For exmple, if tem hs big led, the coching stff might chnge plyers or use up remining time on the clock. On the other hnd, if tem is triling towrd the end of gme, the stff my pull the golie to increse the probbility of scoring. Some of these rguments lso pply to other sports, including bsebll. Recent reserch in sbermetrics (Ciccolell 2006; Miller 2007), however, suggests tht the distributions of runs scored nd runs llowed cn indeed be considered independent. We tested whether this rgument is true for hockey by performing non-prmetric sttisticl tests of Kendll s Tu nd Spermn s Rho (Hogg et l 2005) for ech tem on gmeby-gme bsis. Below re our results of ech of these tests, which test the null hypothesis tht the distributions of nd re independent: Tests of Kendll s Tu nd Spermn s Rho Kendll's Tu for 2008/09 Seson p-vlue for 2008/09 Seson Kendll's Tu for 2009/10 Seson p-vlue for 2009/10 Seson Kendll's Tu for 2010/11 Seson p-vlue for 2010/11 Seson Tem Anheim Ducks Atlnt Thrshers Boston Bruins Bufflo Sbres Clgry Flmes Crolin Hurricnes Chicgo Blckhwks Colordo Avlnche Columbus Blue Jckets Dlls Strs Detroit Red Wings Edmonton Oilers Florid Pnthers LA Kings
11 Minnesot Wild Montrel Cndiens Nshville Predtors Islnders Rngers NJ Devils Ottw Sentors Phildelphi Flyers Phoenix Coyotes Pittsburgh Penguins Sn Jose Shrks St Louis Blues Tmp By Lightning Toronto Mple Lefs Vncouver Cnucks Wshington Cpitls Spermn's Rho for Seson p-vlue for Seson Spermn's Rho for Seson p-vlue for Seson Spermn's Rho for Seson p-vlue for Seson Tem Anheim Ducks Atlnt Thrshers Boston Bruins Bufflo
12 Sbres Clgry Flmes Crolin Hurricnes Chicgo Blckhwks Colordo Avlnche Columbus Blue Jckets Dlls Strs Detroit Red Wings Edmonton Oilers Florid Pnthers LA Kings Minnesot Wild Montrel Cndiens Nshville Predtors Islnders Rngers NJ Devils Ottw Sentors Phildelphi Flyers Phoenix Coyotes Pittsburgh Penguins Sn Jose Shrks St Louis Blues Tmp By Lightning
13 Toronto Mple Lefs Vncouver Cnucks Wshington Cpitls After we ssume commonly-ccepted criticl thresholds of 0.05 nd 0.10, instituting Bonferroni corrections reduces these thresholds to nd Since our p- vlues for our estimtes of τ nd ρ re well bove these thresholds, we hve no reson to believe the existence of ny meningful dependence between the distributions. Therefore, our ssumption bout gols scored nd gols llowed being independent is not unresonble. Intuitively, the effects we described t the beginning of the section probbly contribute to the slight dependence in gols scored nd gols llowed. These effects, however, essentilly wsh out, similr to the findings in Ciccolell (2006) nd Miller (2007) for bsebll. V. Model testing: Goodness of Fit We performed chi-squred goodness of fit tests to determine how well the Weibull densities conform to the true distributions of gols scored nd gols llowed. For most tems, we tested the joint distributions by splitting our dt bsed on the following bins: [-0.5,0.5] U [0.5,1.5] U [1.5,2.5] U [2.5,3.5] U K U [8.5,9.5] U [9.5, ] These bins re pproprite to ensure tht our dt occurs in the center of our bins (this is lwys true, s the gols scored nd llowed must be non-negtive integers). The number of bins ws determined on tem by tem bsis ccording to ech tem s distribution of gols scored nd gols llowed. To perform our test, we computed the following sttistics (Sho, 1999): χ χ 2 2 = = # bins k = 1 # bins k = 1 obs obs ( k) # gmes # gmes k + 1 ( k) # gmes # gmes k k + 1 k k + 1 k f ( x; k + 1 k f ( x; f ( x; f ( x;, ) dx, ) dx, ) dx, ) dx
14 where obs (k) nd (k) obs endpoint k nd right endpoint k+ 1 nd is the number of entries into prticulr bin k with left k k # gmes f ( x;, ) dx / +1 # gmes f ( y;, ) dy (with there being 82 gmes in +1 k k hockey seson) is the expected proportion of the number of gmes tem should hve in bin k ccording to the Weibull density. Under the null hypothesis tht the distributions of gols scored nd gols llowed for ech prticulr tem follow Weibull distributions, the chi-squre sttistics should follow chi-squred distribution with degrees of freedom equl to one less thn the totl number of bines. We cn reject this null hypothesis t significnce level if the chisqure test sttistic is greter thn or equl to the ( 1 ) th quntile of chi-squred distribution with degrees of freedom one less thn the number of bins (Sho 2009). Our test results re below: Results of Chi Squred Goodness of Fit Tests 2008/09 Seson Degrees Degrees of of 2 2 Tem χ freedom p-vlue χ freedom p-vlue Anheim Ducks Atlnt Thrshers Boston Bruins Bufflo Sbres Clgry Flmes Crolin Hurricnes Chicgo Blckhwks Colordo Avlnche Columbus Blue Jckets Dlls Strs Detroit Red Wings Edmonton Oilers Florid Pnthers
15 LA Kings Minnesot Wild Montrel Cndiens Nshville Predtors Islnders Rngers NJ Devils Ottw Sentors Phildelphi Flyers Phoenix Coyotes Pittsburgh Penguins Sn Jose Shrks St Louis Blues Tmp By Lightning Toronto Mple Lefs <0.001 Vncouver Cnucks Wshington Cpitls Results of Chi Squred Goodness of Fit Tests 2009/10 Seson 2 χ Degrees of freedom p-vlue 2 χ Degrees of freedom p-vlue Tem Anheim Ducks Atlnt
16 Thrshers Boston Bruins Bufflo Sbres Clgry Flmes Crolin Hurricnes Chicgo Blckhwks Colordo Avlnche Columbus Blue Jckets Dlls Strs Detroit Red Wings Edmonton Oilers Florid Pnthers LA Kings Minnesot Wild Montrel Cndiens Nshville Predtors Islnders Rngers NJ Devils Ottw Sentors Phildelphi Flyers Phoenix Coyotes Pittsburgh Penguins
17 Sn Jose Shrks St Louis Blues Tmp By Lightning Toronto Mple Lefs Vncouver Cnucks Wshington Cpitls Results of Chi Squred Goodness of Fit Tests 2010/11 Seson 2 χ Degrees of freedom p-vlue 2 χ Degrees of freedom p-vlue Tem Anheim Ducks Atlnt Thrshers Boston Bruins Bufflo Sbres Clgry Flmes Crolin Hurricnes Chicgo Blckhwks Colordo Avlnche Columbus Blue Jckets Dlls Strs Detroit Red Wings Edmonton Oilers Florid Pnthers LA Kings
18 Minnesot Wild Montrel Cndiens Nshville Predtors Islnders Rngers NJ Devils Ottw Sentors Phildelphi Flyers Phoenix Coyotes Pittsburgh Penguins Sn Jose Shrks St Louis Blues Tmp By Lightning Toronto Mple Lefs Vncouver Cnucks Wshington Cpitls Our p vlues re lmost lwys well bove commonly ccepted criticl thresholds of 0.05 nd Furthermore, fter instituting Bonferroni corrections, our criticl thresholds drop to nd respectively, nd ll of our distributions except the Toronto Mple Lefs in 2008/09 nd the Phildelphi Flyers in 2010/11 fll below our necessry criticl thresholds. As result, it is not unresonble to ssume tht virtully ll of our distributions of nd for ech of our 30 tems follow Weibull distributions. VI. Conclusions nd Future Reserch Our results provide sttisticl justifiction for pplying the Pythgoren Won- Loss formul to hockey. We estimte vi mximum likelihood estimtion to be slightly bove two. Our tests of sttisticl independence nd goodness of fit re quite 18
19 strong, illustrting tht the Pythgoren Won-Loss formul is just s pplicble to hockey s it is to bsebll. We hope this reserch encourges the use of the Pythgoren Won- Loss formul s n evlutive tool in hockey. There re number of potentil venues of future reserch tht we hope this work will encourge: 1. Future reserch should go on to exmine the sttisticl ppropriteness of pplying the Pythgoren Won-Loss formul to other sports, such s bsketbll nd soccer. Reserchers could then use the formul s bsis for compring tems of different ers nd understnding the effects of hiring well-known coches or superstrs, s well s the expected gins resulting from mid-seson signings. 2. One could lso perform more micro nlysis s suggested in Miller (2006) to incorporte lower order effects. Bsebll hs severl nturl cndidtes, rnging from prk effects to the presence or bsence of designted hitter depending on where the gme is plyed. Similrly, there re nturl cndidtes to investigte in hockey. The first is rink effects, rnging from hving the home crowd to slight differences in the rinks (see Weiner 2009 for some of the differences between rinks, even though they ll hve the sme dimensions for the ice). Other items include power plys (which mens both how well tem does on power plys, s well s how likely they or the opponent is to provide n opportunity), meningless gols lte in the gme (such s gols scored by the leding tem when the triling tem pulls its golie), nd overtime scoring (nd its reltion to clssifying the gme s win or loss). As our model lredy does gret job explining the dt, it is likely tht these re lower order effects tht mostly wsh out, but it would still be interesting to see the size of their effects. 3. Almost surely professionl sports plyers do not discuss how to ensure their scoring conforms to Weibull distribution. Regrdless, we used such model here s doing so leds to trctble double integrl tht cn be solved in closed form. One of primry dvntges of the Pythgoren formul is the simplicity of the resulting sttistic; however, in n ge of powerful nd everpresent computing power, the need for simple sttistic is lessened. Consequently, there re severl other pproches one my tke:. One possibility is to look t liner combintions of Weibull distributions. The resulting fit to the dt cnnot be worse, s our sitution is just the specil cse of one Weibull distribution. One would hve sum of individully trctble integrls, ll yielding closed-form expressions. b. Along these lines, one could replce Weibull distribution with liner combintion of Weibull distribution nd point mss t zero. Such model llows one to ccommodte for the probbility of being shut out nd hve nother density to model scoring. A similr ide is 19
20 used vi qusi-geometric model in (Glss nd Lowry, 2008) to model scoring in bsebll gmes. c. The scoring dt for both bsebll nd hockey is well-modeled by one-hump distribution, nmely the probbility initilly rises to mximum nd then continuously flls. Insted of using Weibull distribution, one could use Bet distribution insted, where the Γ( + b) 1 b 1 density becomes f ( x;, b) = x (1 x) I( 0 x 1) Γ( ) Γ( b) (with, b > 0 our shpe prmeters); here Γ is the Gmm function (which is generliztion of the fctoril function, with Γ(n+1) = n! for n non-negtive integer) nd I(0 x 1) is the indictor function which is 1 for x between 0 nd 1 nd 0 otherwise. For mny choices of nd b we find tht Bet distribution cptures the generl shpe of the observed scoring dt; however, while closed-form expressions exist for the men nd the vrince of the Bet distribution in terms of its prmeters, for generl choice of the prmeters we do not hve nice closed form expression for the needed double integrl. Thus, if Bet distributions were to be used, one would be reduced to numericl pproximtions to find the dependence of the winning percentge on the prmeters of the tems. Acknowledgements We would like to thnk Eric Fritz for writing Jv script to downlod hockey dt from ESPN.com, Mike Tylor, Hovnnes Abrmyn nd Arnl Dyrtn for proofreding, Armn Ambti for help with the dt nd Benjmin Kedem for insightful comments. VII. References Americn Institute of Physics, Stremlining The Pythgoren Theorem Of Bsebll (2004, Mrch 30), ScienceDily. Apple, Chris nd Foster, Mrc. "Plyoffs projections bsed on Pythgoren Performnce" 2002, Jnury 10. Sports Illustrted. Csell G. nd Berger R., Sttisticl Inference, Second Edition, Duxbury Advnced Series, Ciccolell, R. Are Runs Scored nd Runs Allowed Independent, By the Numbers 16 (2006), no. 1, Cochrn, J. nd Blckstock, R. Pythgors nd the Ntionl Hockey Legue, Journl of Quntittive Anlysis in Sports (2009), 5 (2), Article
21 ESPN. NHL Expnded Stndings 2008/09. ESPN: The Worldwide Leder in Sports. ESPN. NHL Expnded Stndings 2009/10. ESPN: The Worldwide Leder in Sports. ESPN. NHL Expnded Stndings 2010/11. ESPN: The Worldwide Leder in Sports. Foster, Mrk. "Benchmrcs, Performing to Expecttions" (2010, December 19). Hockey Prospectus Glss, D. nd Lowry, P. J. Qusigeometric Distributions nd Extr Inning Bsebll Gmes, Mthemtics Mgzine (2008), 81 (2), Hogg, R.V.; Crig, A.T.; nd McKen, J.W., Introduction to Mthemticl Sttistics, Sixth Edition, Prentice Hll Inc, Jmes, B. The Bill Jmes Abstrct, self-published, Jmes, B. The Bill Jmes Abstrct, self-published, Jmes, B. The Bill Jmes Abstrct, self-published, Jmes, B. The Bill Jmes Abstrct, Bllntine Books, Jmes, B. The Bill Jmes Abstrct, Bllntine Books, Miller, S.J., A Derivtion of the Pythgoren Won-Loss Formul in Bsebll, Chnce Mgzine 20 (2007), no. 1, An bridged version ppered in The Newsletter of the SABR Sttisticl Anlysis Committee 16 (Februry 2006), no. 1, 17 22, nd n expnded version is vilble t Oliver, D. Bsketbll On Pper, Potomc Books, Rosenfeld, J.W.; Fisher, J.I.; Adler, D; nd Morris, C. Predicting Overtime with the Pythgoren Formul, Journl of Quntittive Anlysis in Sports (2010), 6, no. 2. Ryder, A. Win Probbilities: tour through win probbility models for hockey (2004), Hockey Anlytics Schtz, A. Pythgors on the Gridiron. Footbll Outsiders, July 14, Sho, J. Mthemticl Sttistics, Springer,
22 Weiner, E. Not every 200 foot by 85 foot NHL rink is the sme, Off the Wll, October 9, 2009 (5:00pm). 22
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