Predictive Modelling of Undergraduate Student Intake - aair
Predictive Modelling of Undergraduate Student Intake - aair
Predictive Modelling of Undergraduate Student Intake - aair
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Transformations – logit function<br />
• Maps (0,1) to (-∞,∞) ∞ ∞)<br />
• Used to transform a<br />
response variable which<br />
is a binomial proportion<br />
• Model is fitted to<br />
transformed Y-variable<br />
logit(Y) = α + βX + ε<br />
• Inverse function used to<br />
“un-transform” results<br />
AAIR Forum 2008<br />
14<br />
The logit function<br />
y = ln(x) - ln(1-x)<br />
Anatoli Lightfoot – ANU