Table 2.

Assignment rules of s_c, s_l, and s_t

Parameter	Value
sc	If the event types are the same, sc = 1 Else, sc = 0
sl	If locations are the same at the village/town level, sl = 0.8 Else if the locations are the same at the county/district level and at least one post lacks the village/street information, sl = 0.6 Else if the locations are the same at the city level and at least one post lacks the county/district information, sl = 0.4 Else if the locations are the same at the province level and at least one post lacks the city information, sl = 0.2 Else, sl = 0
st	If the time difference is less than 1 min, st = 0.9 Else if the time difference is less than 1 h, st = 0.7 Else if the time difference is less than 1 day, st = 0.5 Else if the time difference is less than 3 days, st = 0.3 Else, st = 0