Fig. 3

MSEs of the ML estimates based on different sampling designs for \((\alpha _1,\theta _1,\alpha _2,\theta _2)=(1,2,0.5,1)\) under different levels \(\sigma\) of imperfect ranking.

MSEs of the ML estimates based on different sampling designs for \((\alpha _1,\theta _1,\alpha _2,\theta _2)=(1,2,0.5,1)\) under different levels \(\sigma\) of imperfect ranking.