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-   -   Math: How to solve ranking equation (http://www.chiefdelphi.com/forums/showthread.php?t=135638)

Ether 10-03-2015 19:07

Re: Math: How to solve ranking equation
 
Quote:

Originally Posted by Rachel Lim (Post 1456192)
Please let me know if anything is wrong and I'll correct try to correct it.

There's an extra word in that sentence.



Rachel Lim 10-03-2015 19:11

Re: Math: How to solve ranking equation
 
Quote:

Originally Posted by Ether (Post 1456198)
There's an extra word in that sentence.

Thanks for catching that. :) Did you find any errors in my analysis?

Ether 10-03-2015 19:19

Re: Math: How to solve ranking equation
 
Quote:

Originally Posted by Rachel Lim (Post 1456199)
Thanks for catching that. :) Did you find any errors in my analysis?

Based on the paper you wrote for Math Quiz 6, I wouldn't expect to find any :-)



ATannahill 11-03-2015 06:48

Re: Math: How to solve ranking equation
 
Quote:

Originally Posted by MooreteP (Post 1456174)
Plus, for Qualifications, if the number of teams is not divisible by six, there are surrogate matches, which are the third match for teams that fill the surrogate role.

More Math!

Not quite correct.

If the number of teams * the number of matches per team is not a multiple of six, then you will have surrogates.

Michigan (and I believe most other district systems) gives each team 12 matches. A benefit to this is that there will never be a surrogate.

Danny Diaz 11-03-2015 09:42

Re: Math: How to solve ranking equation
 
Quote:

Originally Posted by Rachel Lim (Post 1456192)
If you're looking for a more visual explanation (or a simpler one), I wrote up this summary for my team: http://goo.gl/lx2I2l

Impressive.

-Danny

who716 11-03-2015 12:22

Re: Math: How to solve ranking equation
 
Quote:

Originally Posted by Rachel Lim (Post 1456192)
If you're looking for a more visual explanation (or a simpler one), I wrote up this summary for my team: http://goo.gl/lx2I2l

I tried to explain the math behind it without calculus or too much statistics, which makes it easier to read but not nearly as in depth as the official explanation (in my opinion). It's mostly a graphical / algebra based analysis to get at the basics of what district ranking is and how your ranking at an event factors into it.

Note: I haven't taken any statistics classes and we're not yet in districts, so I'm not sure if everything I wrote is completely accurate. Please let me know if anything is wrong and I'll try to correct it.

this was actually helpful and understandable, helped me grab the actual meaning behind the inverse error function instead of just plugging it into a calculator too solve.

Danny Diaz 12-03-2015 14:59

Re: Math: How to solve ranking equation
 
In case you're looking for something in Excel, here's something I whipped up.

http://www.chiefdelphi.com/media/papers/3117

-Danny


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