On Mon, 2 Apr 2012, Marc Carter went:
A p of .05 does not automatically mean that 5% of the positive results are false positives. It just means that on any given test (if everything else is correctly done) there's a probability of .05 that you're getting a false positive.
No--there's no way to calculate the probability that you're getting a false positive. The p value tells you the probability that you WOULD get a false positive (i.e., your current results) IF THE NULL HYPOTHESIS WERE TRUE. A lot of null hypotheses aren't true. How many? Not calculable. But that makes 5% an absolute worst-case scenario (if everything is done right). --David Epstein da...@neverdave.com --- You are currently subscribed to tips as: arch...@jab.org. To unsubscribe click here: http://fsulist.frostburg.edu/u?id=13090.68da6e6e5325aa33287ff385b70df5d5&n=T&l=tips&o=17092 or send a blank email to leave-17092-13090.68da6e6e5325aa33287ff385b70df...@fsulist.frostburg.edu
