I'm working on a project where I have about 120,000 sources and my supervisor has told me to work out what significance to use for taking results.(adsbygoogle = window.adsbygoogle || []).push({});

I had set it at 3 sigma. But there's roughly 1 in 500 chance that we will get a 3 sigma result by chance.

I've been looking for a table to compare the sigma with probability of random occurrence, but I don't think I'm typing the right thing into google or something because I can't find what I'm after!

Also, any recommendations on what I should be going for would be great, 1 in 1,000,000 chance? more or less? I'm not really sure what I should do here. Any advice would be greatly appreciated, my understanding of statistics is lacking :(

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# What sigma value to use?

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