f(x;θ)=θ 1
​
θ 2
3
​
exp{a 0
​
(x)+a 1
​
(x)θ 1
​
+a 2
​
(x)θ 2
​
},x,θ 1
​
,θ 2
​
∈R, where θ=(θ 1
​
,θ 2
​
), and a 0
​
(⋅),a 1
​
(⋅) and a 2
​
(⋅) are some known, real-valued functions. Let x 1
​
,…,x n
​
be a random sample drawn independently from the distribution, and denote a
ˉ
0
​
= n
1
​
∑ i=1
n
​
a 0
​
(x i
​
), a
ˉ
1
​
= n
1
​
∑ i=1
n
​
a 1
​
(x i
​
) and a
ˉ
2
​
= n
1
​
∑ i=1
n
​
a 2
​
(x i
​
).