Earlier in the week Chandoo presented Give more details by showing average and distribution
At the top of the post was a small screen capture from Amazon.com showing a 5 Star chart showing that Twilight had a 3.5 Star Rating (way over-rated if you ask me).
I received an email shortly afterwards from Rajiv, “How can I make one of those charts ? ” with the Stars Circled
It’s actually very simple and this post will show you how.
The Technique
The technique involves putting a mask in front of a single bar from a Bar Chart
The mask has a plain background and has cut-outs where the Stars are, which are transparent and so only the bar chart shows through in those areas which are cut out.
Lets Do It
On a worksheet we need a cell where we have a Rating Value, lets use B2
Make the value in Cell B2, 5
Select the cell B2 and Insert Chart
Insert a Bar Chart (Clustered Bar)
Delete the following chart objects
- Title
- Legend
- Major Grid Lines
Select the Horizontal Axis
Format Axis
Change the Horizontal Axis Scale to
- Minimum 0
- Maximum 5
Delete the Horizontal and Vertical Axis
Move the chart and resize the Bar to your requirements
Change the Bar’s Fill to suit
Set Border color to No Color
Insert Picture
Import the 5 Star mask attached here
Position the mask in front of the charts Bar
With the mask selected shift the Right hand side and then left hand side so that you can just see the edges of the bar.
Check the placement by trying the numbers from 0, 1, 2, 3, 4, 5 and 0.1 in B2
You should see all the stars perfectly when the placement is correct
Select the Chart and 5 Star Mask together
Use Shift while selecting each one
Group the Chart and Mask together, so that they can’t be moved
Your are free to shift and resize this combined object on your worksheet as required
Vertical Charts
A Similar technique can be used for Vertical Charts using a Column Chart instead of a Bar Chart
Masks
The masks used here were made in CorelDRAW, but can be made in any Drawing/Paint program like Paint.NET, that allows you to save PNG’s with Transparency effects
The masks consists of:
- 5 Stars which have no outline color and are transparent
- 1 Rectangle which is White with no Outline color
The 6 objects are then Joined enabling the holes of the Stars to show through the White Rectangle
Using this technique any shape can be used as a mask
I have included the following masks for you to practice with or use:
5 Stars Mask with Outlined Stars,
If anybody knows how to join objects together in Excel to make holes through them as required here, Please let us know in the comments below:
Thermometer Charts
The above technique is great for application to Thermometer Charts, where the Thermometer can take on all values from 0 to 100% or 0 to $200,000
or whatever you require.
Files
All the above examples are shown in one file which you can download here or here for the 2003 Version
Download the Waves and Chameleon 2007 or Waves and Chameleon 2003 examples
Extensions of the Technique
This technique can be extended in a number of areas
The Thermometer chart above shows one such area
The other is applying multiple Masks to multiple Bars/Columns in one chart, But I’ll leave you to practice that.
Limitations of the Technique
Two main limitations of this technique are:
Scaling
As Excel charts are scaled, Excel internally decides what space should be between the Plot Area, Titles and the edge of the Chart Area. This is not maintained constantly and hence the Plot Area may scale at a different ratio to the Chart area and overlying mask.
If this happens Ungroup the Chart and mask and reset ecverything at the new size.
Mask Color
The mask has a Fixed color, in the above examples it is white.
The mask cannot be colored in Excel to Match the background color of the Worksheet if it isn’t white.
So a new Mask will need to be made.
What Do you Think of this Technique
What Do you Think of this Technique?
How else can you see this technique being extended?
Let us know in the comments below:
14 Responses to “Group Smaller Slices in Pie Charts to Improve Readability”
I think the virtue of pie charts is precisely that they are difficult to decode. In many contexts, you have to release information but you don't want the relationship between values to jump at your reader. That's when pie charts are most useful.
[...] link Leave a Reply [...]
Chandoo,
millions of ants cannot be mistaken.....There should be a reason why everybody continues using Pie charts, despite what gurus like you or Jon and others say.
one reason could be because we are just used to, so that's what we need to change, the "comfort zone"...
i absolutely agree, since I've been "converted", I just find out that bar charts are clearer, and nicer to the view...
Regards,
Martin
[...] says we can Group Smaller Slices in Pie Charts to Improve Readability. Such a pie has too many labels to fit into a tight space, so you need ro move the labels around [...]
Chandoo -
You ask "Can I use an alternative to pie chart?"
I answer in You Say “Pie”, I Say “Bar”.
This visualization was created because it was easy to print before computers. In this day and age, it should not exist.
I think the 100% Bar Chart is just as useless/unreadable as Pies - we should rename them something like Mama's Strudel Charts - how big a slice would you like, Dear?
My money's with Jon on this topic.
The primary function of any pie chart with more than 2 or 3 data points is to obfuscate. But maybe that is the main purpose, as @Jerome suggests...
@Jerome.. Good point. Also sometimes, there is just no relationship at all.
@Martin... Organized religion is finding it tough to get converts even after 2000+ years of struggle. Jon, Stephen, countless others (and me) are a small army, it would take atleast 5000 more years before pie charts vanish... patience and good to have you here 🙂
@Jon .. very well done sir, very well done.
good points every one...
I've got to throw my vote into Jon's camp (which is also Stephen Few's camp) -- bars just tend to work better. One observation about when we say "what people are used to." There are two distinct groups here (depending on the situation, a person can fall in either one): the person who *creates* the chart and the person who *consumes* the chart. Granted, the consumers are "used to" pie charts. But, it's not like a bar chart is something they would struggle to understand or that would require explanation (like sparklines and bullet graphs). Chart consumers are "used to" consuming whatever is put in front of them. Chart creators, on the other hand, may be "used to" creating pie charts, but that isn't an excuse for them to continue to do so -- many people are used to driving without a seatbelt, leaving lights on in their house needlessly, and forwarding not-all-that-funny anecdotes via email. That doesn't mean the practice shouldn't be discouraged!
[...] example that Chandoo used recently is counting uses of words. Clearly, there are other meanings of “bar” (take bar mitzvah or bar none, for [...]
[…] Grouping smaller slices in pie chart […]
Good article. Is it possible to do that with line charts?
Hi,
Is this available in excel 2013?