The sum of squares is the method for finding the variation within the groups , between the groups and for the total sample.
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The sum of squares is basically the sum of the square of variation, where variation is defined as the spread between each individual value and the mean. In order to determine the sum of squares, the distance between each data point and the line of best fit is squared and then summed up. The line which is known as line of of best fit will minimize this value.
The sum of squares is the method for finding the variation within the groups, between the groups and for the total sample.In this method the variations between values are find out irrespective of whether it is of a group or not.
Hence the sum of squares is the method for finding the variation within the groups , between the groups and for the total sample.
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