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Current KRACH - ?? because sites do not match

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  • Current KRACH - ?? because sites do not match

    Can the math guys out there help me with something? I am looking at the KRach rankings on USCHO and CollegeHockeyNews right now (after all games Friday). All the schools' records match between the 2 sites, but the rating numbers do not.

    I don't understand how that can be. Especially since I think I understand the way KRACH works. It makes no sense to me that the iterations can settle to 2 different sets of numbers.

    Thanks ahead of time.

    Numbers.

  • #2
    Re: Current KRACH - ?? because sites do not match

    Are you sure they have identical inputs?

    Edit: I'd wage it's off SOMEWHERE...

    By concavity a solution exists for the maxima and the solution is unique. Another possibility is that they're on different multiplicative scales.

    If games are missing/added then most of the ratings should be similar save the mis-inputs... After that I've got nothing
    Last edited by Patman; 12-31-2011, 12:30 AM.
    BS UML '04, PhD UConn '09

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    • #3
      Re: Current KRACH - ?? because sites do not match

      Patman,
      I thought about this again, and one idea came to mind. Do you know that trick where they add a tie with a team that doesn't exist to everyone's schedule early in the year to make it so that all the teams are connected? Is it possible that one site hasn't deleted that yet?

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      • #4
        Re: Current KRACH - ?? because sites do not match

        Originally posted by Numbers View Post
        Patman,
        I thought about this again, and one idea came to mind. Do you know that trick where they add a tie with a team that doesn't exist to everyone's schedule early in the year to make it so that all the teams are connected? Is it possible that one site hasn't deleted that yet?
        if so they'd be off all season... I suppose the easiest way to check that... if they print the SOS then, IIRC, the KRACH is equal to

        SOS*win%/(1-win%)... if they're putting in the fraction, this is where I'd check
        BS UML '04, PhD UConn '09

        Jerseys I would like to have:
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        AIC Yellowjacket Jersey w/ Yellowjacket logo on front
        UAF Jersey w/ Polar Bear on Front
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        NCAA Men's Division 1 Simulation Primer

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        • #5
          Re: Current KRACH - ?? because sites do not match

          Originally posted by Numbers View Post
          Is it possible that one site hasn't deleted that yet?
          Bingo. It's now removed on our calculation. Without the fictitious tie, it can't be calculated until all teams have played.

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          • #6
            Re: Current KRACH - ?? because sites do not match

            Originally posted by Numbers View Post
            Patman,
            I thought about this again, and one idea came to mind. Do you know that trick where they add a tie with a team that doesn't exist to everyone's schedule early in the year to make it so that all the teams are connected? Is it possible that one site hasn't deleted that yet?
            Idle aside: I believe John Whelan has opined that the "best" way to calculate KRACH is with two fictitious games, not just one. It's a statistics thing.
            Northeastern Huskies Class of 1998 / BS Chemical Engineering
            Notre Dame Fighting Irish Class of 2011 / PhD Chemical Engineering

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