Not sure about the implementation in Lucene but term frequency is
usually normalized.
Wikipedia: http://en.wikipedia.org/wiki/Tf%E2%80%93idf#Mathematical_details

Marek


PlusPlus wrote:
> Hi,
>
>    I was wondering why TF method gets a float parameter. Isn't frequency
> always considered to be integer? 
>
>    public abstract float tf(float freq)
>
> Best,
> Reza
>   


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