7/3/2023 0 Comments Calculate iqr in spss ibmTukey would say that the median is at depth 13.5. The median is the average of the 13th and 14th cases, or 31. A simple example shows how the hinges are calculated. Tukey's book emphasized techniques that can be done by hand with a minimum of calculation. The two fences provide upper limits for the whisker length each whisker is drawn to that data value which is furthest from the median but still within the corresponding fence's distance from it. These values approximate, but in general do not match, the 25th and 75th percentiles reported by SPSS. SPSS follows his definition of the plot, where the upper and lower limits of the box are the Tukey hinges H1 and H2. The boxplot was developed by John Tukey and presented in his book Exploratory Data Analysis.
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