APPLYING INFOR-MATION RE-TRIEVAL TO TEXT MINING2011.10.26.Data mining Lab이아람

IR ( Information retrieval )

Returning relevant texts for query

A measure of similarity is computed be-

tween the query and each document

The similarity scores

The vector space model

Counting Letters

Counting Letters

Counting Letters

Counting words

Counting words

Counting Pronouns Occurring

Counting Pronouns Occurring

he shehim herhis herhis hershimselfherself

TEXT COUNT AND VECTOR

Vectors and Angles

두 Text 를 비교하기 위해 Angle 이용 Vector 를 이용하여 Angle 을 구한다 . Angle 값이 0 에 가까울 수록 두 Text 는

유사함

Vectors and Angles

Inner product Dot product

Vectors and Angles

Vector length =

Computing Angles

Computing Angles

Computing Angles

Computing Angles

cosθ = 0.89503

Angle of 0.46230 radians, which about 26.5º