After I published the study of US mass shooting distribution from 2013 to 2015, I am asked by some: are those incidents in proportion to the population?
Hence comes this further research on incidents vs population. I used three measures for the comparison:
- population rank
- incident occurrence rank
- incidents/population rank
I chose to use a sorted DNA chart to compare the three measures. If the number of incidents is proportional to the population, then the ranking would have been the same, ie, all falling on the anti-diagonal. The chart shows that that the number of incidents is not in proportion to the population. Not even close. For example, Louisiana has the highest incidents per population while its population is ranked at 25th and its number of incidents is ranked at 9th nationwide.
So, the country is not as uniform as one might think. There must be other reasons behind the differences. Click image to see the interactive version.
(Refresh the page if you want to view the gif image multiple times. Or go to Tableau Public and click the button at the top-right corner.)
The key idea is to float a semi transparent worksheet on top of the dashboard, where a help text box is strategically placed on top of each chart. This way, we can explain how to view each chart and what data points are important, etc. This worksheet is collapsible by a show/hide button.
Below I would like to show how this worksheet can be constructed.
1. Sheet with a single data mark.
- Double click the empty space in Marks panel and add two single quotes. Make the null pill a text label. This creates a single null mark.
- Set the view as "Entire View"
2. Create an show/hide button
- Go to the target dashboard
- Drag a floating vertical container to the dashboard, making it cover all the area of interest.
- Drag the Single Null Mark sheet and drop it into the above container. Hide the sheet title.
- Create an open/close button for the container and place the button at the top-right corner.
3. Add annotations
- Format the sheet background opacity as 70% in the layout manager
- Select area annotations and place them anywhere of interest.
- Write help text and format it to highlight important messages.
- The text can serve as functional guide and/or insight guide.
Here is an example. Feel free to download the workbook and explore. Click the "i" button at the top-right corner to view the in-place help.
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