Table 1 Maximum likelihood analysis and comparison of Poisson models

$\widehat{\lambda }$ = 90.2, $\widehat{\mu }$ = 90.2, $\stackrel{\_}{{\sigma }^2}$ = 90.2

$\stackrel{\_}{{\gamma }_1}$ = 2.7, $\stackrel{\_}{{\gamma }_2}$ = 32.9, $\widehat{\mu }$ = 90.2,

$\stackrel{\_}{{\sigma }^2}$ = 3049.7

$\widehat{\lambda }$ = 387.6, $\stackrel{\_}{{\beta }_1}$ = 2.17, $\stackrel{\_}{{\beta }_2}$ = 7.16,

$\widehat{\mu }$ = 90.1, $\stackrel{\_}{{\sigma }^2}$ = 2683.9

$\stackrel{\_}{{\gamma }_1}$ = 6.4, $\stackrel{\_}{{\gamma }_2}$ = 19.0, $\stackrel{\_}{{\beta }_1}$ = 1.3,

$\stackrel{\_}{{\beta }_2}$ = 0.46, $\widehat{\mu }$ = 90.1, $\stackrel{\_}{{\sigma }^2}$ = 2538.2