Table 1. Average Absolute Error of Weekly Hand-Foot-Mouth Disease Cases Estimated by the Three Estimators.

Number of hospitals	B-SHADE	Ratio estimator	Simple estimator
2	8.64	10.63	49.24
3	5.89	10.65	48.38
4	1.71	2.00	6.32
5	1.33	1.48	5.06
6	1.10	1.58	4.65
7	0.68	1.09	2.85
8	0.52	1.03	2.53
9	0.37	0.69	0.65