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Calculating TF

Posted on 2008-11-11
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Last Modified: 2012-05-05
I have a question, I'm crating a script that will calculate the TF from a document. I have the document stored in a vector.

My question is when I print the vector I get the frequency of times the words appear in the text, for example the word college appears 10 times in the text. Should I keep the numbers like this or should I make the number between 0 and 1?

Because every where that I look they say that the TF is 0.1 or 0.9.

Here is the code I have to calculate the frequency.
#Get the word frequency from the text.
for my $word (@$words){
   $wordcount{$word}++;
}

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Question by:Ennio
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Expert Comment

by:Adam314
ID: 22932032
Keeping the TF between 0 and 1 means it is normalized.  To do this, divide every number by the highest frequency.

Whether or not you do this will depend on how you are using it.
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by:Ennio
ID: 22932053
So I should dived it to the highest frequency or the number of words in the text?

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Adam314 earned 2000 total points
ID: 22932084
By the highest frequency.

For examle, if you had this:
    college: 10
    apple: 6
    letter: 16
You would divide each by 16, because it is the highest frequency, getting:
    college: .625
    apple: .375
    letter: 1.0
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Author Comment

by:Ennio
ID: 22932103
ok... thanks... because I was looking some where and they said to divide by the total numbers of terms in the text.  That make sense now.

:)
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Expert Comment

by:Adam314
ID: 22932164
Well, again it depends on what you are looking for, but you could divide each by the total number of terms in the text.
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