21 comments Whenever we deal with large amounts of data, one of the goals for analysis is, How is this data distributed? This is where a Box plot can help. According to Wikipedia, a box plot is a convenient way of graphically depicting groups of numerical data through their five-number summaries: the smallest observation (sample minimum), lower quartile (Q1), median (Q2), upper quartile (Q3), and largest observation (sample maximum) [] Quartile?!? What is that like?

When we say $ 39,000 is the lower quartile of salaries paid in Acme inc. It means, 25% of people make less than or equal to $39,000 Like that Median (Q2) means half the samples are lower than median & the other are more than median. Example Box Plot Here is an example box plot depicting salaries of all analysts in USA as per our. The box shows distribution of middle half of data (salaries) while the lines (called as whiskers) show minimum and maximum salaries. As you can see, 50% of the analysts make between $46,000 to $75,000 while the min is $10k and max is $160k. Why use Box plots? Box & whisker plots are an excellent way to show distribution of your data without plotting all the values.

They are easy to understand. We can use them whenever we have lots of data or dealing with samples drawn from larger population.

Creating Box plots in Excel – 9 step tutorial Despite their utility, Excel has no built-in option to make a box plot. Of course you can make a 3D pie chart or stacked horizontal pyramid chart. Lets save them for your last day at work and understand how to create box plots in Excel. Step 1: Calculate the number summaries Assuming your data is in list use formulas MIN, MAX & PERCENTILE to calculate summaries like below: To calculate 25th percentile (Q1) use = PERCENTILE(list, 25%) Step 2: Make a bar chart from Q1, Median & Q3 Just select the 25th percentile, median & 75th percentile values and create a bar chart.Make sure that your chart shows 3 different colored bars not 3 bars in one color. Step 3: Set series overlap to 100% Select any bar, press CTRL+1 (right click > format series) and adjust series overlap to 100% Step 4: Adjust series order so that you can see all the bars If you cannot see all the bars, right click on chart, click on “Select data”. Now, adjust the series order using arrow keys so that you can see all the bars.

See this demo: Step 5: Make 25th percentile (Q1) bar invisible Select the bar corresponding to Q1 and fill it with white color. If you make it transparent, it will not work. So make it all white.

Step 6: Add error bars to Q1 & Q3 series Just select Q1 (25th percentile) bar and add error bar (any type) from layout ribbon. Repeat for Q3 series as well. Step 7: Set up error values in your data Add an extra column in your data area and use simple formulas to calculate error values, like below: Step 8: Set up custom error values for Q1 & Q3 Select the error bar for Q1 (25th percentile) and, • Press CTRL+1 to format them • Enable only minus (negative) error bar with no cap. • Select Custom as error amount and point to the calculated value. Putty ssh for mac. Repeat for Q3, but choose positive error bar instead. Step 9: Format the box plot to your taste Remove any legend, axis, labels that you do not need. Change colors to suit your taste and mood.

Make the whiskers subtle and knock off the grid lines. You are good to go.

Making Box plots interactive Since box plots are very useful to understand distribution of values, we use them in dashboards etc. Naturally, you are interested to know how values are distributed for various things. In this example, we may want to know how analyst salaries compare with manager salaries. To make things complicated, we have 10 different job types, thus enabling 45 possible comparisons (10c2) This is where interactive box plots can help. See this demo to understand: Interactive Box plot in Excel – a Demo How to make interactive box plot in Excel Construction of box plot is same as mentioned above.

The difference is in adding interactivity. Step 1: Use combo box form controls to capture comparison criteria Excuse the tongue twister. Using Developer ribbon > Insert > Form controls, add 2 combo box controls and point them to the list of job types. Lets assume that these combo boxes are linked to cells D1, D2. [Related: ] Step 2: Calculate 5 number summaries using MINIF, MAXIF and PERCENTILEIF formulas Don’t rush to type the formulas yet. There is no such formula as MINIF (or MAXIF or PERCENTILEIF). Assuming your list of jobs are in joblist, write =MIN(IF(joblist=”Analyst”, list_of_values,””)) and press CTRL+Shift+Enter Using MAX(IF()) and PERCENTILE(IF()) you can calculate remaining 4 summaries.

Excel does not come with boxplot charts. What is the best technique to simulate boxplot charts in Excel? I'm interested to. Draw horizontal and vertical charts; display the mean in addition to the quartiles and median. This video demonstrates how to create a boxplot (box and whisker chart) using Microsoft Excel 2016. Boxplots are used to analyze the distribution of scores in variables.