Step 4: Calculate the z-score for each data value. Next, use the following formula to calculate the percentile of the first value: Step 3: Find the percentile of each data value. Next, use the following formula to calculate the rank of the first value:Ĭopy this formula down to all of the other cells in the column: Step 2: Find the rank of each data value. If your data is not already sorted, go to the Data tab along the top ribbon in Excel, then go to the Sort & Filter group, then click the Sort A to Z icon. Note that this data is already sorted from smallest to largest. Perform the follow steps to create a Q-Q plot for a set of data.Įnter the following data into one column: This tutorial explains how to create a Q-Q plot for a set of data in Excel. In most cases, this type of plot is used to determine whether or not a set of data follows a normal distribution. A Q-Q plot, short for “quantile-quantile” plot, is often used to assess whether or not a set of data potentially came from some theoretical distribution.
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