Rank range for Match Against

I have a select statement that returns the rank of a search term.

select ititle, ifullurl, idesc, icontent, MATCH (ititle, icontent) AGAINST ('industrial automation') as rank from ff_index where (MATCH (ititle, icontent) AGAINST('industrial') AND MATCH (ititle, icontent) AGAINST('automation')) order by rank desc LIMIT 0, 20

Can someone tell me what the range is for the rank? I have seen it get above 6 so I would assume that it is from 0 to 10. Can someone verify that for me? Thanks.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
Relevance is computed based on the number of words in the row, the number of unique words in that row, the total number of words in the collection, and the number of documents (rows) that contain a particular word.

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rbichonAuthor Commented:
Ok. So you are saying that there is no max value for the rank/relevance?
Guy Hengel [angelIII / a3]Billing EngineerCommented:
correct. the more words in the collection correspond to a word in the row, the higher the value. the less words in the row, the higher the value...
rbichonAuthor Commented:
I guess then I will just calculate a relevancy percentage for each record using the maximum value in the index. Thanks for your help.
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