Posted by kelly on Monday, July 30, 2012 at 2:13pm.
Sort out the data in increasing order.
If there are n pieces of data, calculate nc=√n to be the number of classes. Round up to the next integer if necessary.
Find class width by dividing n by nc. Again round up to the next integer if necessary.
Start the first class with the smallest value (or smallest value -1) and increment each class start point by adding class width to the previous.
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