Table 5.

The effect of parameter β on the model

α	β	Seen	Unseen	Harmonic mean
0	0.00	0.79	0.63	0.701
0	0.01	0.79	0.69	0.736
0	0.02	0.79	0.66	0.719
0	0.03	0.79	0.67	0.725
1	0.01	0.80	0.62	0.698