Hello Mike, On Apr 23, 2010, at 12:55 AM, Mike Marchywka wrote:
> Mark Twain gets to the front so quickly. Again, I'm not suggesting > you did anything wrong or bad, I haven't actually checked numbers > or given the specific test a lot of thought- 9 data points is usually > not all that conclusive in any case and I guess that's my point. > There are 10 means, each mean comes from 1K data points, so there are 10K data points for each version tested, not just 9 Unlike other tests of significance, t-test doesn't need a large number of observations. It is actually this case of "few observations" e.g. 10 means one of its main use-cases. Indeed one would need to check the assumptions of independence and normality. Looking at the response times though looks ok normal distribution ... I owe you the scatter and QQ plots. I really would not expect a Gamma going on but I might be wrong :) Best regards, Giovanni ------------------------------------------------------------------------------ _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.itextpdf.com/book/ Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/
