Automatic detection of new domain-specific words, using document ...

4.3. To compute a score for a certain domain. . .
1 count text tokens that are a member of the domain t ∈ D ∩W
2 weigh count by size of domain-specific vocabulary v = 1 √
|D|
3 weigh score by number of domains the text token is
a member of
w = 1 d
where d = ∑i |t ∩ Di|
4 consider number of ‘unknown’ text tokens u (same as n − k)
5 consider number of ‘known’ text tokens k (same as n − u)
6 consider text length (to make score relative) n (same as u + k)
sD = 1 k
· · v
n u