This following %RSD example is based upon a data set of 5 values. The final stage of the calculation is to express the result as a percent which the *100 does. The AVERAGE function calculates the mean of the data set while the STDEV calculates the standard deviation (SD) of the data. The excel %RSD calculation requires two functions Average and STDEV. The main use for %RSD is in analytical chemistry and is routinely used to assess the variation of sets of data. The %RSD function is popular with non-statisticians as the interpretation is based on a percent result and not some abstract value. %RSD (relative standard deviation) is a statistical measurement that describes the spread of data with respect to the mean and the result is expressed as a percentage. The result is expressed as an percentage, with a low number (<2.5%) indicating a small spread of values and a high value indicating a significant spread of results. In the cell where the formula is written a value between 0-100 will be reported. The above %RSD example has been entered into the Excel formula bar and will calculate the percent relative standard deviation of the 5 value data set E6 to E11. = (STDEV(Data Range) / AVERAGE(Data Range))*100 To calculate the %RSD in Microsoft Excel a short formula must be used: %RSD is a powerful tool to statistically inspect the variation in sets of data but a specific function is not available in Excel 2003, 2007 or even 2010. Percentage relative standard deviation is a widely used statistical tool but strangely there is no automated function in any version of Microsoft Excel. This guide will detail how to calculated the relative standard deviation (%RSD) using Excel, then walk through a worked example and finally detail the limitations of the calculation. The standard deviation will be calculated, and the result will be displayed in a new worksheet.Excel and Relative Standard Deviation %RSD In the Standard Deviation dialog box, enter the range of cells that contains the data, and then click OK. In the Data Analysis dialog box, select the Standard Deviation worksheet, and then click OK. To do this, go to the Data tab, and then click Data Analysis. Once the toolpak is installed, you can use it to calculate standard deviation. In the Add-Ins dialog box, select the Analysis ToolPak check box, and then click OK. In the Manage box, select Excel Add-ins, and then click Go. In the Options dialog box, click Add-Ins. To do this, go to the File tab, and then click Options. To use the toolpak, you first need to install it. The Data Analysis toolpak is an Excel add-in that you can use to perform statistical analyses. This will calculate the standard deviation of the numbers in cells A1 through A20. For example, if the numbers are in cells A1 through A20, you would select cell A21. To use the function, enter the numbers in a column, and then select the cell where you want the result to appear. The STDEV function calculates the standard deviation of a set of numbers. The first way is to use the STDEV function, and the second way is to use the Data Analysis toolpak. There are two ways to calculate standard deviation in Excel.
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