( Yang and Pedersen , 1997 ) has found strong correlations between DF , IG and the X2 statistic for a term .
a comparative study on feature selection in text categorization
Y Yang J P Pedersen
Various feature selection techniques have been used in automatic text categorization ; they include document frequency ( DF ) , information gain ( IG ) ( Tzeras and Hartman , 1993 ) , minimum description length principal ( Lang , 1995 ) , and the X2 statistic . ( Yang and Pedersen , 1997 ) has found strong correlations between DF , IG and the X2 statistic for a term . On the other hand , ( Rogati and Yang , 2002 ) reports the X2 to produce best performance .
( @@CITATION ) has found strong correlations between DF , IG and the X2 statistic for a term .