Save your data using the assign operator, < -, and the combine function c(). ![]() Subtract Q1 from Q3 to get the interquartile range. Use the function stats(x1) to find Q1 and Q3 for your data. To find the third quartile use the formula =QUARTILE(Range 3)įor example, if your data is in cells A1 through A10, you would type =QUARTLE(A2:A11, 3)Ĭalculate the upper boundary: Q3 + (1.5)(IQR)Ĭalculate the lower boundary: Q1 - (1.5)(IQR)Ĭreate a table and input your data in the x1 column. To find the first quartile use the formula =QUARTILE(Data Range 1)įor example, if your data is in cells A2 through A11, you would type =QUARTLE(A2:A11, 1) You can use the Outlier formula in Excel or Google sheets using the following steps. The difference in the calculations won’t be enough to alter your results significantly. Some of the software below uses different approaches to calculating quartiles than what we used in the examples above. Note that there are several accepted ways to calculate quartiles. While it’s important to know what the outlier formula is and how to find outliers by hand, more often than not, you will use statistical software to identify outliers.įollow these steps to use the outlier formula in Excel, Google Sheets, Desmos, or R. Q1 = 220, Q3 = 320, IQR = 100, lower boundary = 70, upper boundary = 470Ĭalculate Outliers Using Statistical Software To find Q3, you need to take the average of the 6th and 7th values. To find Q1, you need to take the average of the 2nd and 3rd values of the data set. When calculating Q1 and Q3, the locator value L is a whole number. Note that there are only 8 data points (n=8).
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