LIS 601: Week3
Term Weighting: TF * Discrimination Value (DV)

Where:

w_ij = weight of Term T_j in Document D_i


tf_ij = frequency of Term T_j in Document D_i



dv_j = Q - Q_j

_Where:

Q = space density before Term T_j is added

Q_j = space density after Term T_j is added

Nota Bene:

Low frequency:

dv_j = 0

Medium frequency:

dv_j > 0

High frequency:

dv_j < 0

Derived from:

Salton, G. 1989. Automatic text processing. Chapter 9.

Page creator: J. Stephen Downie
Page created: 24 September 1997
Page updated: 25 September 1997