[Corpora-List] calculating word density

[n.toumi at reading.ac.uk]

Dear readers,

I'm looking for suggestions on how to calculate word density in a corpus. 
knowing the number of occurrences of that word and the number of words in 
that corpus.

One method I thought of is to count the number of occurrences per 1000 or 
10000 words.

Can anyone suggest other ways.

Thank you for advice.

Regards,

Naouel