Can someone explain these numbers to me?

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  • Rich Boy
    SBR Hall of Famer
    • 02-01-09
    • 9714

    #1
    Can someone explain these numbers to me?


    I have been betting on the Nationals (ya I know...) +1.5 for these 13 games and have won only 3.

    I have calculated the probability of winning each time according to the closing Pinny (+1.5/-1.5) Runline.

    I used a binomial distribution to determine there is a 2% chance of winning only 3 of 13 games where the average win percentage is 55%

    Does anyone have a logical explanation for this? Is this just a fluke occurrence? Are the Nationals heavily over-valued? Is my math correct?

    If anyone can provide some insight I would appreciate it, thanks.
  • Rich Boy
    SBR Hall of Famer
    • 02-01-09
    • 9714

    #2
    In all of the games they played on the road and were underdogs (ranging from +150 to +200)

    Also all of my probabilities are according to the No-Juice Pinny closers.
    Comment
    • Rio DiNero
      SBR MVP
      • 11-03-08
      • 2010

      #3
      My advice to you= DO NOT BET WASHINGTON
      Comment
      • Justin7
        SBR Hall of Famer
        • 07-31-06
        • 8577

        #4
        Washington is frighteningly bad. They lead the league in errors with 45 - this is a management issue (the league median is 26). They have a rare combination of mediocre batting with a weak bullpen - this means they'll sometimes play a competitive first 5 innings, and get crushed later.

        As significant, your sample size is small. Additionally, how good are Pinny's closing numbers? I'd suggest making the matchbook closer the new standard.
        Comment
        • xyz
          SBR Wise Guy
          • 02-14-08
          • 521

          #5
          What was your reasoning behind those bets? Why did you think those are +ev bets? Those are more important questions to have an answer for than any short term fluctuations.
          Comment
          • PAPSMEAR
            SBR MVP
            • 02-13-09
            • 2581

            #6
            I can honestly say that I have no idea what your talking about ... but I do know that the Nationals are not an investment proposition EVER! I wouldn't even bet them with Shanty's money
            Comment
            • floridagolfer
              SBR MVP
              • 12-19-08
              • 2757

              #7
              Why do you believe the average win percentage is 55 when the team involved is only going to win about 33 percent of its games?

              That team's pitching is horrendous.
              Comment
              • MonkeyF0cker
                SBR Posting Legend
                • 06-12-07
                • 12144

                #8
                This is far too small of a sample size. Your variance in your distribution is 3.1668, yielding a standard deviation of 1.779550505. You would need a sample size of at least 29 (28.5012) to have 95% confidence within (±) 1 game.
                Comment
                • Rich Boy
                  SBR Hall of Famer
                  • 02-01-09
                  • 9714

                  #9
                  I know that the sample is quite small. Im just concerned that the books numbers are not accurate.

                  Justin, are you suggesting that Matchbook closers are now sharper than Pinny closers? Which book do you feel is the sharpest for Alternate runlines (-1.5/+1.5)?
                  Comment
                  • MonkeyF0cker
                    SBR Posting Legend
                    • 06-12-07
                    • 12144

                    #10
                    The zero-vig closers are generally very close between Pinny and Matchbook actually. The pricing may have been off on the Nats but with a sample of that size, you cannot come up with any definitive answer.
                    Comment
                    • Justin7
                      SBR Hall of Famer
                      • 07-31-06
                      • 8577

                      #11
                      Originally posted by Rich Boy
                      I know that the sample is quite small. Im just concerned that the books numbers are not accurate.

                      Justin, are you suggesting that Matchbook closers are now sharper than Pinny closers? Which book do you feel is the sharpest for Alternate runlines (-1.5/+1.5)?
                      Yes. No idea on alternate runlines.
                      Comment
                      • veto
                        SBR High Roller
                        • 09-12-08
                        • 109

                        #12
                        the logical explanation for this is that the nats need to learn how to catch the f*ckin ball.
                        Comment
                        • Rich Boy
                          SBR Hall of Famer
                          • 02-01-09
                          • 9714

                          #13
                          Update



                          Nationals continue to screw me, yet I dont learn... Maybe I deserve to lose?

                          Also to make things worse, I didnt bet on them a single time during their 8 game win streak...
                          Comment
                          • Joe Dogs
                            SBR MVP
                            • 07-20-09
                            • 1931

                            #14
                            Washington nats
                            Comment
                            • smitch124
                              SBR Posting Legend
                              • 05-19-08
                              • 12566

                              #15
                              Originally posted by Rich Boy
                              Also to make things worse, I didnt bet on them a single time during their 8 game win streak...
                              You missed the whole return to the mean...
                              Comment
                              • roasthawg
                                SBR MVP
                                • 11-09-07
                                • 2990

                                #16
                                Originally posted by Justin7
                                Additionally, how good are Pinny's closing numbers? I'd suggest making the matchbook closer the new standard.
                                Good call... matchbook lines are the sharpest out there. I tried to pick off weak lines at mb using other books lines and got hammered.
                                Comment
                                • aca
                                  SBR MVP
                                  • 03-20-06
                                  • 2111

                                  #17
                                  a small sample size!
                                  Comment
                                  • GELATINOUS CUBE
                                    SBR MVP
                                    • 08-09-09
                                    • 4534

                                    #18
                                    Yeah the nationals suck.

                                    55% is your natural, hypothetical odds of the nats winning a given game +1.5.

                                    But the nats hypothetical odds of winning a game is 50%. Cuz there are two teams.
                                    But what is the nats win percentage?? The sports page is over there, but i know its way lower than 50%.

                                    So the nats suck, (cuz they're not owned by a huge corporation or 3 or 4, i think they're owned by one guy, these teams always suck).
                                    blog '09-'10: 37-16: +$31,900
                                    mlb 2010; 16-12: +$4,540
                                    gellyhoops 2010: 10-6 +$3,150
                                    overall: 63-34 +$40,290
                                    Comment
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