Table 3 Definitions of individual indicators
From: Identification of conclusive association entities in biomedical articles
Type | Indicator | Definition |
|---|---|---|
(1) Frequency-based | TF | TF(e, a) = Number of times e appears in a |
(2) Rareness-based | IDF | \( IDF(e)={Log}_2\frac{\mid A\mid +{1}^{\left[\mathrm{i}\right]}}{DF(e)+{1}^{\left[\mathrm{i}\mathrm{i}\right]}} \) |
(3) Co-occurrence-based | CoOcc | \( CoOcc\left(e,a\right)=\sum \limits_{x\in a,x\ne e}\frac{{\left|{S}_{e\cap x}(a)\right|}^{\left[\mathrm{iii}\right]}}{{\left|{S}_e(a)\right|}^{\left[\mathrm{iv}\right]}} \) |
(4) Concentration-based | AvgTF | \( AvgTF(e)=\frac{c{\left(e,C\right)}^{\left[\mathrm{v}\right]}}{DF(e)} \) |
(5) Locality-based | TITLE | \( TITLE\left(e,a\right)=\left\{\begin{array}{c}1,\mathrm{if}\ \mathrm{e}\ \mathrm{a}\mathrm{ppears}\ \mathrm{in}\ \mathrm{title}\ \mathrm{of}\ \mathrm{a};\\ {}0,\mathrm{otherwise}.\end{array}\right. \) |
AbstractX | \( AbstractX\left(e,a\right)=\left\{\begin{array}{c}1,\mathrm{if}\ \mathrm{e}\ \mathrm{a}\mathrm{ppears}\ \mathrm{in}\ \mathrm{the}\ \mathrm{first}\ \mathrm{X}\ \mathrm{or}\ \mathrm{Last}\ \mathrm{X}\\ {}\ \mathrm{sentences}\ \mathrm{in}\ \mathrm{abstract}\ \mathrm{of}\ \mathrm{a};\\ {}0,\mathrm{otherwise}.\end{array}\right. \) |