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This is kind of a programming question, but really it's math in disguise!

I'm working on a little project that will look at the size of a file and make sure it's in within an acceptable range based on previous file sizes. I know how to get the average file size of previous files and all that.

I'm wondering if there is an equation or a method that I can dynamically create an acceptable range depending on avg file size, number of files, or some other statistical value. I can provide more details if needed, but I really don't know where to start.

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I apologize if this is better suited for Statistical Analysis -- I figured Mathematics would cover that subset so I didn't really look further until after I posted. Migrate if necessary. –  Shaded Feb 4 '11 at 15:36

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up vote 1 down vote accepted

You may want to try testing whether the size of the file in question is within say 1 standard deviation of the average size.

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That will probably work, my only concern is in cases where the sample size is small. For example one case I have in testing my results give me an average size of 234 kB and a Standard Deviation of 204 kB which is kind of a huge range. Never-the-less thank you very much for the response! –  Shaded Feb 4 '11 at 15:51

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