This subtraction results in a loss of significant figures and if a large set of values being handled by a computer, this can result in a corrected sum of square Which has many fewer, accurate Significant figures than Calculations. Various Various alternative schemes are available to combat this. One method is to scale the value8 an arbitrary origin which is approximately equal to the mean: if successful, this will reduce the loss in significant to first calculate the mean and then Bum the powers of the deviations from the mean. This involves each value being considered twice: first in evaluating the mean and then when calculating its deviation from the mean. If the set of values is large and is being handled by a computer this ean involve either storing the data in slow speed store or reading the same data into the computer twice. third A method which is less cumbersome than either of these is outlined below The basis of the method is an iteration for for deriving the corrected of squares sum for values from the corrected sum of squares for the first 1) of these. We are given a set of xs'8 (เ k) for which we require the corrected sum of squares.