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Evaluation of the Australian Wage Subsidy Special Youth ...

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235<br />

Table 7.2 summary <strong>of</strong> changes to exclusion restriction <strong>of</strong> Heckman specification<br />

Model <strong>of</strong> ever<br />

employed<br />

in 1986 survey<br />

Original results Panel 1 Panel 2 Panel3<br />

Add age to employment Add CEP referrals to Add both age and CEP<br />

equation<br />

employment<br />

referrals to employment<br />

Replication<br />

results<br />

Replicated<br />

equation<br />

weighted<br />

for all<br />

attrition<br />

No weights<br />

weighted<br />

for all<br />

attrition<br />

equation<br />

No weights<br />

weighted<br />

for all<br />

attrition<br />

equation<br />

No weights<br />

weighted<br />

for all<br />

attrition<br />

Observations 1283 1283 1283 1283 1283 1283 1283 1283<br />

SYETP 1.596** 0.933 Not 1.06 Not 0.32 Not 0.38<br />

estimable<br />

estimable<br />

estimable<br />

(2.85) (0.79) (0.77) (0.23) (0.25)<br />

Rho=-1 Rho=-1 Rho=-1<br />

Age coefficient<br />

0.01 0.00<br />

in employment<br />

equation<br />

(0.30) (0.17)<br />

CEP referral<br />

-0.03 -0.03<br />

coefficient in<br />

employment<br />

equation<br />

(-0.39) (0.40)<br />

Estimated rho -0.75 -0.21 -0.28 0.14 0.11<br />

Wald test <strong>of</strong> 0.34 0.08 0.11 0.41 0.02<br />

Rho=0 (chi2<br />

(1) statistic)<br />

Log likelihood -875.96 -858.74 -858.68 -858.64 -858.55<br />

LR chi 2 (df) 159 (118)<br />

396.79<br />

(118)<br />

429.85<br />

(119)<br />

443.03<br />

(119)<br />

436.99<br />

(120)<br />

457.81<br />

Akaike 1.55 1.52 1.52 1.52 1.53<br />

Information<br />

Criterion<br />

Coefficient is reported with absolute value <strong>of</strong> t statistic in brackets.<br />

159 This is <strong>the</strong> likelihood ratio test <strong>of</strong> <strong>the</strong> hypo<strong>the</strong>sis that all coefficients except <strong>the</strong> intercept are equal to<br />

zero. It is defined as LR = 2 (log likelihood M full – 2 log likelihood M intercept ). The degrees <strong>of</strong> freedom (df) <strong>of</strong><br />

this chi squared distributed statistic are equal to <strong>the</strong> number <strong>of</strong> constrained parameters i.e. <strong>the</strong> number <strong>of</strong><br />

coefficients being tested.

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