Parameter

$\widehat{\alpha }$

$\widehat{\delta }$

$\widehat{\beta }$

$\widehat{\mu }$

Model 1 ( $\lambda =-\frac{1}{2}$ )

0.4215579

3.285072

−0.03586155

0.5137899

Model 2 ( $\lambda =+\frac{1}{2}$ )

0.5491998

2.425010

−0.03904892

0.536296

Model 3 ( $\lambda =-\frac{3}{2}$ )

0.2778586

4.098694

−0.03234413

0.4882795

Model 4 ( $\lambda =+\frac{3}{2}$ )

0.6724609

1.418126

−0.04177948

0.5546103