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Jul 20, 2010 at 23:48 comment added russellpierce They are pretty different guidelines. I suspect the disconnect is whether you think that the test of the overall model matters (the lower N guideline) or the test of the individual slopes that matter (the higher N guideline).
Jul 20, 2010 at 21:37 comment added Vivi the two answers look too different to me. One says 20 to 30, the other says 20 to 30 times slopes. So if you have 5 slopes, one rule tells you 20 to 30, the other 100 to 150 observations. That doesn't seem right to me....
Jul 20, 2010 at 14:04 history answered russellpierce CC BY-SA 2.5