I did consider RSD as a measure of precision (as, by the way, everything else published at ballistipedia -- excellent resource indeed).
There is, however, a slight problem -- RSD considers vertical and horizontal axis independently to get SD (and then provides an aggregate measure). While, strictly speaking, this is more accurate (the biggest approximation error of Taran calculations comes from the assumption of circularity), I have finally chosen the circular Mean Radius / Rayleigh model for the following reasons:
- mean radius is easy to understand intuitively; RSD is not
- Rayleigh makes it way easier to estimate error margins and confidence levels, and understand what they mean (mind you -- the confidence levels are probably the reason of being of the app, the rest is just callipers with attitude).
- circular approximation allows to establish direct comparisons with common group size measures (5 and 10-shot max spread)
- the information/number-of-shots ratio of Rayleigh is only very marginally inferior to RSD
This being said, for the average point of impact there were no such limitations (requirements of comparability with circular measures and single error margin) -- I have used the independent X and Y axis measures, and established separate confidence levels for vertical and horizontal values.
If you have any leads as how average 5- and 10-shot group spread relate to specific values of RSD, and how to establish error margins on RSD measurements -- I would very much appreciate if you could share this, I'd love to learn new things, and then maybe Taran 2.0 may come up.
On the other hand, I recently had contact with the author of shotGroups package for R (Web version here -- https://dwoll.shinyapps.io/shotGroupsApp/ ), which goes well beyond the basic stats provided by Taran's interface. The idea is to leave Taran as it is (dumb and simple), but make the output directly compatible with shotGroups, where extensive statistical analysis can be done by those who really want to push the limits of knowledge.
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