Math questions
 

I have some questions regarding winning %.
Question 1
Team A is .600 against .500 team.
Team B is .400 against .500 team.

What is Team A's winning% against Team B?

Question 2

Team A is .550 against average .450 teams.
What is Team A's winning % against .500 teams.

I have been using simple methods for both questions.
Question 1 .600-.400+.500=.700
Question 2 .550+.450-.500=.500

However I have been feeling it is not accurate.
Is there any better methods for these question?

Thanks.

Re: Math questions
 

[img]/images/graemlins/shocked.gif[/img]

Re: Math questions
 

What does that mean?
So Can you describe and justify any methods on this matter?
I assume you can not.

Re: Math questions
 

team a with .450 record isn't equal to team b with .450 record

Re: Math questions
 

[ QUOTE ]
I have some questions regarding winning %.
Question 1
Team A is .600 against .500 team.
Team B is .400 against .500 team.

What is Team A's winning% against Team B?

Question 2

Team A is .550 against average .450 teams.
What is Team A's winning % against .500 teams.

I have been using simple methods for both questions.
Question 1 .600-.400+.500=.700
Question 2 .550+.450-.500=.500

However I have been feeling it is not accurate.
Is there any better methods for these question?

Thanks.

[/ QUOTE ]

60%/40% = 1.5
40%/60% = 0.66667 (2/3)

1.5/0.66667 = 2.25

2.25/3.25 = 69.2%


Imagine you have 60 red balls and 40 white balls. You put them all in a tub and randomly select 1. Whatever color is selected is the winning color. Red will win 60% of the time.

Take those 40 white balls out and put them into a tub with 26.66667 blue balls (yes, blue balls). Just pretend there is such a thing as 2/3 of a ball, instead of making me talk about millions of balls. The white balls will win 60% of the time now.

Take those 26.6667 blue balls out and put them into the tub with the 60 red balls. Red will win 69.2% of the time.

Re: Math questions
 

i did math once and it hurt, so's i took up golf.

damn, that hurt, too.

-c

Re: Math questions
 

I suggest reading this post: http://forumserver.twoplustwo.com/sh...6755&page=

which is a post concerning (or correcting) the article I wrote on NFL power ratings: http://www.twoplustwo.com/magazine/issue33/yao0907.html



(edited just to make the links active -P)

Re: Math questions
 

i'm just going to throw my question here.....

how do i calculate power ratings? can i do i relatively easily in microsoft excel?

or do i need special software?... thinking about doing power ratings for canadian football.

thanks in advance!!

Re: Math questions
 

You should be using a log5 method IIRC. I don't have the stuff in front of me. But I think Tom Tango does a good treatment of this (and Bill James... Damn where did I read this?)

Boom.

http://www.insidethebook.com/ee/inde..._ratio_method/

That should be what you need to calc this type of thing.

Note: After reading through Yao's post, it seems to be what he is saying.

Re: Math questions
 

Thank you for answering my questions.
These articles King Yao and Thremp linked helped me a lot.