Tools and templates
Small tools that go with the articles. Free to use, and free to take apart and adapt. More will turn up here as the series goes on.
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DSO XmR calculator
Paste your monthly DSO and see which months are routine variation and which ones look like a signal. Runs in your browser; nothing is sent or saved.
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DSO XmR chart (Excel)
The same chart as a workbook you can keep: your months in, limits, rule flags and both charts out.