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Table 1 

Effect of parameter setting on performances.

ParameterRole of parameterEffect on performance
W window size larger windows best suited to capture world-wide events 
Δ discretization size larger discretization best suited to capture world-wide events 
|Σ| dimension of alphabet larger alphabets positively affect purity, negatively affects recall 
f frequency threshold higher frequency positively affects purity, negatively affects recall 
δ clustering parameter higher values positively affect purity, negatively affect recall 
τ splitting parameter higher values positively affect purity, negatively affect recall 
ParameterRole of parameterEffect on performance
W window size larger windows best suited to capture world-wide events 
Δ discretization size larger discretization best suited to capture world-wide events 
|Σ| dimension of alphabet larger alphabets positively affect purity, negatively affects recall 
f frequency threshold higher frequency positively affects purity, negatively affects recall 
δ clustering parameter higher values positively affect purity, negatively affect recall 
τ splitting parameter higher values positively affect purity, negatively affect recall 
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