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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)