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Standard deviation is a mathematical measurement that identifies how concentrated or how widespread your range of round ratings would be. If you have five rounds with ratings of 800, 850, 900, 950 and 1000, you would have a very large standard deviation of 79 indicating you were inconsistent. However, if you have ratings of 880, 890, 900, 910 and 920, you are a very consistent player with a low standard deviation of 16. Standard deviation is a function built into Excel and you can calculate it by entering your round ratings. Whatever your standard deviation, 2/3 of your rounds will fall within one standard deviation on either side of your rating unless you are a fast improving player.
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