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

Table 9 Annotation statistics used in the analysis.

Frequency	$f r e q_{t_{i}} = \frac{D_{t_{i}}}{D} = \frac{# d o c s_{t_{i}}}{# d o c s}$	(Eq. 1)
Mean	$m e a n_{t_{i}} = μ_{_{t_{i}}} = \frac{# a n n o t s_{t_{i}}}{# d o c s_{t_{i}}}$	(Eq. 2)
Standard deviation	$s t d_{t_{i}} = σ_{t_{i}} = \sqrt{1 / # d o c s_{t_{i}} \sum_{j = 1}^{# d o c s_{t_{i}}} {(# a n n o t s_{t_{i}, d o c_{j}} - μ_{t_{i}})}^{2}}$	(Eq. 3)
Variance-to-mean	$V M R_{t_{i}} = \frac{{σ_{t_{i}}}^{2}}{μ_{t_{i}}}$	(Eq. 4)
Co-annotation	$f r e q_{t_{i}, t_{j}} = \frac{D_{t_{i} \cap t_{j}}}{D_{t_{i}}} = \frac{# d o c s_{t_{i} \cap t_{j}}}{# d o c s_{t_{i}}}$	(Eq. 5)