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Table 9 Annotation statistics used in the analysis.

From: Stringent response of Escherichia coli: revisiting the bibliome using literature mining

Frequency

fre q t i = D t i D = # d o c s t i # d o c s

(Eq. 1)

Mean

mea n t i = μ t i = # a n n o t s t i # d o c s t i

(Eq. 2)

Standard deviation

st d t i = σ t i = 1 / # d o c s t i j = 1 # d o c s t i ( # a n n o t s t i , d o c j - μ t i ) 2

(Eq. 3)

Variance-to-mean

VM R t i = σ t i 2 μ t i

(Eq. 4)

Co-annotation

fre q t i , t j = D t i t j D t i = # d o c s t i t j # d o c s t i

(Eq. 5)