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Evaluation of the Australian Wage Subsidy Special Youth ...

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191<br />

post-school qualification, and longest job held by 1984 is 2 to 3 years. The variables that<br />

change statistical significance, are interviewed in Western Australia/ Tasmania in 1984,<br />

Roman Catholic schooling, highest qualification was schooling to year 12, no job held by<br />

1984, CEP referrals in 1984, mo<strong>the</strong>rs occupation was plant operative, and brought up in<br />

o<strong>the</strong>r Christian religion.<br />

Sample reduction is found to affect <strong>the</strong> results <strong>of</strong> modelling SYETP quite substantially.<br />

Comparison between <strong>the</strong> full data and reduced data estimates shows significant<br />

differences between <strong>the</strong> results <strong>of</strong> <strong>the</strong> models, and <strong>the</strong>se are interpreted as representative<br />

<strong>of</strong> <strong>the</strong> presence <strong>of</strong> attrition bias. This supports <strong>the</strong> <strong>the</strong>oretical position that bias is<br />

introduced to <strong>the</strong> estimates. It also concurs with <strong>the</strong> empirical material <strong>of</strong> Alderman et al.<br />

(2000) discussed earlier where similar impacts on modelling were also found. The next<br />

section deals with multivariate modelling <strong>of</strong> <strong>the</strong> sample reduction. Weights are <strong>the</strong>n<br />

produced to account for <strong>the</strong> sample reduction.

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