Re: Weight of evidence (WOE)

Posted by David Marso on Jan 05, 2012; 5:03pm
URL: http://spssx-discussion.165.s1.nabble.com/Weight-of-evidence-WOE-tp5122524p5123255.html

See AGGREGATE, CASESTOVARS and COMPUTE.

DEBOER wrote

age               good      bad     tot          column%        outcome       woe           infomationvalue

18-20           150355    4667  155022      4%          3%               -0.4949        0.0119

21-41           2013941  46674  2060615    51%        2.3%             -0.2027        0.0229

41+             1840080   24434  1864514    46%         1.3%            0.3542          0.0484

tot               4004376   75775  4080151   100%        1.9%                               0.0834

Ok, We have a variabel age, I do a crosstab in spss with age and default(0=good and 1=bad).
I get outcome from bad/tot
WOE= Ln(good)-Ln(goodtot(4004376)) -Ln(bad)+(Ln(badtot(75775))
Informationvalue= WOE*((good/goodtot)-(bad/badtot))