Parameter

$\widehat{\alpha }$

$\widehat{\delta }$

$\widehat{\beta }$

$\widehat{\mu }$

Model 1

1.124238

1.574226

−0.2517274

0.572402

Model 2

1.612872

2.805817

−0.4751398

0.9361947

Model 3

0.976286

0.9163648

−0.1451396

0.4193146

Model 4

1.167188

1.631209

−0.2491203

0.5691122

Model 5

1.395091

1.480994

−0.2974406

0.6455598

Model 6

1.426388

1.767935

−0.2627765

0.5908363