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A TopBoxTornado plot is a concise way to present top- and bottom-box scores
for multiple ratings on Likert-type scales.
<img src="/images/blog/2017-09-14/pew q5 tornado.png" style="max-width: 100%"/>

Market research surveys often ask respondents to rate multiple items 
e.g. "How much do you agree with the following statements?". The response scale may be 5-, 7-, 10- or 11-point scales. 
An effective way to present the results is to look at top-box scores, 
showing percentages for the top one, two or three scale items, 
e.g. "Somewhat agree or Strongly agree". 
Sometimes though the client also wants to know the bottom-box score too.
The tornado plot is a visually interesting way to show both top- and bottom-box.
The middle scale points (and any missing/NA values) are hidden in the middle.
<h2 id="export-to-powerpoint">Export to PowerPoint</h2>
These also export to PowerPoint as native Office chart objects:
<img src="/images/blog/2017-09-14/pew q5 pptx.png" style="padding: 5px; border: 1px solid grey; max-width: 100%"/>
<h2 id="create-a-topboxtornado">Create a TopBoxTornado</h2>
To create a TopBoxTornado chart in Protobi, press the blue square edit icon for a group of rating questions and select Edit... .Then in the JSON, specify a <code>chartType</code> attribute: 
<pre>
 {
 "chartType": "TopBoxTornado"
 }
</pre>

The default is to show the bottom-two box scores on the left and the top-two box scores on the right,
using the <code>format</code> attribute to identify the boxes and sorting them to identify top vs bottom. 
You can override the defaults by specifying a <code>chartOptions</code> attribute as well:
<pre>
 {
 "chartType": "TopBoxTornado",
 "chartOptions": {
 "left": [1,2],
 "right": [4,5],
 "leftTitle": "Very strong or strong conflicts",
 "rightTitle": "Not very strong or no conflicts",
 "leftColor": "purple",
 "rightColor": "gold"

}
</pre>

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