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How to Calculate RSD Percent

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RSD is a method for measuring variance in a data set.

In the field of probability and statistics, relative standard deviation (RSD), also known as the coefficient of variance, measures the precision of the average taken from a data set. The RSD is typically presented as a percentage. When comparing two RSDs, the smaller RSD indicates less variance in the set, and in a scientific setting it typically indicates more accurate measurement.

Instructions

    • 1

      Calculate the standard deviation for your data set. For more help obtaining this calculation, see the Resources section.

    • 2

      Calculate the average of your data set. The average is found by adding every unit in your data set and dividing by the number of units.

    • 3

      Multiply the standard deviation (found in Step 1) by 100.

    • 4

      Divide the product found in Step 3 by the average found in Step 2.

    • 5

      Add a percentage sign to the result of Step 4. This is your relative standard deviation.

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