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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

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