样本联合密度函数为∑∑ == −− − = ∏∏ m i i n i i ii yx mny m i x n i mn yyxxp 1 2 1 1 21 eee),;,,,,,( 21 1 2 1 12111 λλλλλλLL ，似然函数∑∑ = == −− m i i n i i yx mnL 1 2 1 1 e),( 2121 λλλλ ， ∑∑ == −−+= m i j n i i yxmnL 1 2 1 12121 lnln),(ln λλλ ，令⎪ ⎪ ⎩ ⎪⎪ ⎨ ⎧ =−= ∂ ∂ ∑ ∑ = = .0 ln ;0 ln 122 111 m i i n i i y nL x nL λλ得∑ = = n i ix n 1 1λ ， ∑ = = m i iy m 1 2λ ，则mn mm i i nn i i mn yx mn yyxxp −− == ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ = ∑∑ e),;,,,,,(sup 11 2111 , 21 λλ LL ，当λ1 = λ2时，似然函数⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ +− + ∑∑ = == m i i n i i yx mnL 11 1 e)( 11 λ λλ ， ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ +−+= ∑∑ == m i j n i i yxmnL 111 ln)()(ln λλλ ，令0 )(ln 1111 1 =⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ +− + = ∑∑ == m i j n i i yx mn d Ld λλ λ ，得∑∑ == + + = m i i n i i yx mn 11 1λ ，则mn mnm i i n i i mn yx mn yyxxp −−+ == + = ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + + = ∑∑ e )( ),;,,,,,(sup 11 21 λλ LL ，故似然比检验统计量为mm i i nn i i mnm i i nn mn YXmn YYXXp YYXX ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ==Λ ∑∑ == + + == = 11 2111 , 11 )( ),;,,,,,(sup ),,,,,( 21 λλ LL m m i i n n i i mn nn m m i i n i i n n i i m i i n