# How Do You Draw a Box and Whisker Plot in Excel?

### QI Macros add-in creates box whisker plots in seconds.

#### Quick Links:

What is a box and whisker plot?

## What is a Box and Whisker Plot? What is it used for?

**Box and Whisker Plots (Box Plots or Boxplots) **are like simple histograms turned on their side. Use them to analyze the variation between data sets. Box Plots allow you to easily compare medians *between* data sets (where the color changes in each box) and the variation* within* each dataset (i.e. how tall is the box and how long are the whiskers).

I just made my first charts and QI Macros were

very easy and user friendly. This is going to be a great tool.- Jim Welsh

Lennox Industries

## What does each part of a box and whisker represent?

The** box **represents the distance between the 1st and 3rd quartiles--the InterQuartile Range (IQR=Q3-Q1).

For * quartiles*, there are three points: the first middle point (the median), and the middle points of the two halves. These three points divide the entire data set into quarters.

The * whiskers *are 1.5*IQR or the highest / lowest point within the range.

**Outlier** points are those that are greater than 1.5*IQR, from Q1 or Q3.

**Source**: *Juran's Quality Handbook*, Joseph M. Juran, Joseph A. DeFeo.

#### What to look for:

- If the box is all gray, then there is no difference between the 1st quartile and the median.
- If the box is all green, there is no difference between the 3rd quartile and the median.
- If your median value is less than 0, the boxes will indicate this by swapping order (green on top and gray on bottom).

## Why use QI Macros to create Box and Whisker Plots?

### Save Time - Draw Charts in Seconds

You don't need to learn a bunch of formulas or a separate software application. QI Macros works right in Excel.

### Easy to Use

QI Macros is point and click simple. Just select your data and then select QI Macros from the tab we install on Excel's menu. Then select Box and Whisker Plot.

### Look Like an Expert

Be ready to answer - "How did you do that?"

What your organization has done with the excel macros is great. It saves me a lot of time by not having to create the formulas and links. Your QI Macro's are

better than most SPC specific software on the market. I have been using your macros since 1997.- Chuck Whitaker

Nishikawa Standard Co.

### Learn More...

- Box and whisker plot real life example
- Compare QI Macros box plots to others
- How to label the median on a box whisker plot

### More Reasons to Choose QI Macros to Generate Box Plots

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