Just something I thought of today, I'm a professional poker player so this makes a huge impact on my job if I'm able to use it. In online poker you can get software to record player statistics, i.e. How often they have bet/fold/raised etc. What I want to do is get a sample over a day, lets say 1000 hands, then find out how something affects my profitability. I'm worried that a sample size of 1000 will be far too few to gain any accurate information if I just graph: 1-100 101-200 201-300 etc. However if I use: 1-100 2-101 3-102 This should give me a pretty accurate idea shouldn't it? I want to find potential problems based on short term changes, so I can't just get multiple days worth of hands as I would be adding in a huge amount of variables that I can't use, i.e. mood, amount of tables up, etc. etc.