What are some of the retrieval approaches commonly used?

The most commonly used retrieval methods used are

a)Boolean approaches

It is again subdivided into three types

i) Standard Boolean Approach

ii) Smart Boolean Approach

iii) Extended Boolean Approach

b)Statistical Approach.

It is again subdivided into three types.

i) Vector space model

ii) Probabilistic model

iii) Latent semantic indexing.

c)Linguistic and knowledge based Approach.

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