Unit7 A Total B AB B B A
Unit-7
A α Total B (AB) (αB) (B) β (Aβ) (αβ) (β) Total (A) (α) N Intelligent Not Total Intelligent Passed 10 4 14 Failed 3 6 9 Total 13 10 23
Order of the Class : The order of the class is the number of attributes specified. Zero Order Class : A class having no attribute to indicate. First Order Class : A class having one attribute is called first order class. Second Order Class : A class with a combination of two attributes is called second order class
Yule’s Coefficient of association
Yule’s Coefficient of association Ø Ø -1 ≤ Q ≤ 1 Q=1 : There is a perfect positive association between the attributes. Q=-1 : There is a perfect negative association between the attributes. Q= 0 : The attributes are independent.
A α Total B β (AB) 30 (Aβ) 70 (B) 50 (β) 200 Total (A) 100 (αB) 20 (αβ) 130 (α) 150 (αB) = (B) - (AB) = 50 -30 = 20 (N) 250
A B β Total α Total (AB) 18 (αB) 162 (Aβ) 184 (αβ) 396 (B) 180 (β) 580 (A) 202 (N) 760 (αB) = (B) - (AB) = 180 – 18 = 162 (αβ) = (A) - (αβ) = 558 – 162 = 396 (A) = (N) – (A) = 760 – 558 = 202 (Aβ) = (A) - (AB) = 202 – 18 = 184 (β) = (N) – (B) = 760 – 180 =580 (Α) 558
A α (Attacked) (Not attacked) B (AB) 50 (Vaccinated) β (Aβ) 400 (Not vaccinated) Total (A) 450 (αB) 315 Total (B) 365 (αβ) 1235 (αβ) 1635 (α ) 1550 (N) 2000
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