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How to show the Trend Line?
When looking at you WIP in the WIP Run Chart, you can expand the controls for this chart (in red) and decide to show the Trend Line:
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The below panel will appear and allow you to decide what do you want to see:
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By default it will show you the trend line for the 85 percentile of your WIP for the past 10 days. You can decide to change the percentile and interval according to what you want the chart to show you.
How are the percentiles calculated?
We take the number of WIP from the last 10 days (one per day) and orders order them in ascending order rather than the order of days (2, 3, 3, 4, 4, 5, 5, 5, 8, 8).
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WIP: 2 - 3 - 3 - 4 - 4 - 5 - 5 - 5 - 8 - 8
Example:
If we get the below values and then order them we can easily find the values for each percentiles:
Raw values: 5, 6, 6, 7, 7, 6, 5, 4, 4, 3
Ordered values: 3 - 4 - 4 - 5 - 5 - 6 - 6 - 6 - 7 - 7
5 - 50%
6 - 70%
6 - 85%
7 - 95%