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**extjsjquery**- Replies: 1

in online game, two team fight against each other

here

team a strength 73% ,which corespond to 100% (for conveniece, here note 73)

team b strenth 46

then odds ratio =73/(100-73)/ (46/(100-46)=73/27/(45/55)

no problem here

suppose team;s strength divided into two part attck and defense

team a attack=44 defense=6

team b attack=64 defense=33

where 100 correspoinds to the best rank

in odds ratio formula, winthin a group , p, 100-p

since attack+defense is not equal to 100, which puzzled me.

I use several method,

for conveniece

team a attack note m

team a defense n

team b attck o

team b defense p

method 1

strenth=(attack +defense)/2 algebra average value

then use the fumula of odds ratio

odds ratio=((m+n)/2)(100-(m+n)/2)/ ( ((o+p)/2)/(100-((o+p)/2)))

method 2

strength=sqrt((attack +defense) geometry average value

methd 3

regard defense is unlike probilities,juse use odds ratio formula directly

odds ratio=m/p /(o/n)

method 4

odds ratio= m/(100-m)/(p/(100-p))/ (o/(100-o)/(n/(100-n)))

method XX

......

...

which is right? or they were all wrong ? any solution pls give me help?

how to calculate odds ratio?

not 25 if 25 ,2 .777 is right.

like formula Odds ratio = (a/c) / (b/d) ,what is the formula for probability？

**extjsjquery**- Replies: 3

I input a,b,c,d use odds ratio calculator

Cases with positive outcome

Number in 1st group: a=25

Number in 2nd group: b=15

Cases with negative outcome

Number in 1st group: c=18

Number in 2nd outcome: d=30

and calculate

Results

Odds ratio 2.8889

95 % CI 1.2184 to 6.8497

z statistic 2.408

P = 0.0160

I know odds ratio is Odds ratio = (a/c) / (b/d)

my question is

what z statistic and p mean ?

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