Table 1.

Prediction error for real data

District	WAN CHAI	KWUN TONG	KOWLOON CITY	SAI KUNG	WONG TAI SIN	SHA TIN
X Error	0.12	0.02	0.15	0.31	0.13	0.14
District	TUEN MUN	CENTRAL &WEST	NORTH	KWAI TSING	EASTER	TSUEN WAN
Error	0.09	0.09	0.08	0.30	0.25	0.65
District	SOUTHERN	SHAM SHUI PO	TAI PO	YAU TSIM MONG	ISLANDS	YUEN LONG
Error	0.38	0.06	0.15	0.29	0.08	0.25

The average error of 18 districts is 0.20