Indicators

Rc.j

The ratio of conference papers to journal papers, indicating rapidity of communication.

Tn.p,

The total number of papers of a domain in scientific databases, describes the size of a domain

Na.p.p

The average number of authors per paper, measures the size of research teams

Ar.p.p

The growth rate, which is the increasing ratio in average of a domain's documents in a certain period. Ar.p.p(domain, t1, t2) is the documents increasing ratio in average in a domain from t1 to t2. We may define that,

t2

Ar.p.p(domain, t1, t2) = S (Tn.p(domain, t+1)/ Tn.p(domain, t) / (t2 - t1)

Pc.p.p

The percentage of companies' papers in all papers of a domain, portrays the companies' participation

Pc.p.p(domain)= Tn.p(domain, companies)/Tn.p(domain)

Na.m

The domain/term normalized association measure with a given data set in a certain period, which gives a domain/term's association measure with a given data set, 

Terms' occurrences in given data set (from t1 to t2)

Na.m ( term, t1, t2 )=

Term's occurrences in the scientific database (INSPEC, t1-t2 )