Difference between revisions of "Measuring Tools"
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= [http://cran.fhcrc.org/web/packages/shotGroups/index.html shotGroups Analysis Package] = | = [http://cran.fhcrc.org/web/packages/shotGroups/index.html shotGroups Analysis Package] = | ||
| − | Daniel Wollschlaeger built this open-source R package to perform extensive statistical analysis of target groups. | + | Daniel Wollschlaeger built this open-source R package to perform extensive statistical analysis of target groups. It works automatically on data exported from [[#OnTarget]]. |
To get started: | To get started: | ||
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# Open RStudio, and in the console window | # Open RStudio, and in the console window | ||
#* Run <code>install.packages("shotGroups")</code> to download the latest version of '''shotGroups''' with all dependencies. | #* Run <code>install.packages("shotGroups")</code> to download the latest version of '''shotGroups''' with all dependencies. | ||
| − | |||
#* Now run <code>library(shotGroups) # load the package</code> | #* Now run <code>library(shotGroups) # load the package</code> | ||
#* Now you can run the examples. In RStudio all output diagrams will be displayed in the Plots tab: | #* Now you can run the examples. In RStudio all output diagrams will be displayed in the Plots tab: | ||
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#** <code>example(groupShape)</code> | #** <code>example(groupShape)</code> | ||
| − | For more see [http://cran.fhcrc.org/web/packages/shotGroups/shotGroups.pdf the manual] or run <code>help(package="shotGroups")</code> | + | For more, see [http://cran.fhcrc.org/web/packages/shotGroups/vignettes/shotGroups.pdf the package description], [http://cran.fhcrc.org/web/packages/shotGroups/shotGroups.pdf the complete manual for all functions], or run <code>help(package="shotGroups")</code> |
= Spreadsheet Analysis = | = Spreadsheet Analysis = | ||
Given a target data set, whether compiled using the [[#2-Shot Method]] or [[#OnTarget]], all of the analysis described here can be performed using standard spreadsheet functions. See, for example [[Media:CCI 40gr HV 100yd.xlsx]] or any of the other workbooks linked in the [[:Category:Examples|Examples]]. | Given a target data set, whether compiled using the [[#2-Shot Method]] or [[#OnTarget]], all of the analysis described here can be performed using standard spreadsheet functions. See, for example [[Media:CCI 40gr HV 100yd.xlsx]] or any of the other workbooks linked in the [[:Category:Examples|Examples]]. | ||
Revision as of 16:26, 20 January 2014
Tools and practical methods for measuring and analyzing precision.
2-Shot Method
Brent Danielson described a no-frills method for accumulating arbitrarily large shot sample sets for statistical analysis: Since our statistics all depend on the sample radius:
- Shoot two shots at a single aim point
- Measure their center-to-center distance. This produces two radius sample points, both equal to half the measured distance.
- Repeat this process until satisfied with the quantity of data points.
Calculation of sigma from Danielson's sample data, as well as hypothesis analysis, are shown in Media:DanielsonExample.xlsx.
OnTarget
Jeffrey Block's OnTarget Precision Calculator is the most convenient package for converting a target image into data points for analysis. It accounts for scale and distance and automatically calculates Mean Radius (called "Average to Center" in the software) and Extreme Spread (called "Max Spread").
The more expensive Target Data System can automatically identify and aggregate shots on scans of its specially-coded targets.
shotGroups Analysis Package
Daniel Wollschlaeger built this open-source R package to perform extensive statistical analysis of target groups. It works automatically on data exported from #OnTarget.
To get started:
- Install R from http://cran.fhcrc.org/
- Install RStudio from http://www.rstudio.com/ide/download/desktop
- Open RStudio, and in the console window
- Run
install.packages("shotGroups")to download the latest version of shotGroups with all dependencies. - Now run
library(shotGroups) # load the package - Now you can run the examples. In RStudio all output diagrams will be displayed in the Plots tab:
example(groupSpread)example(groupLocation)example(groupShape)
- Run
For more, see the package description, the complete manual for all functions, or run help(package="shotGroups")
Spreadsheet Analysis
Given a target data set, whether compiled using the #2-Shot Method or #OnTarget, all of the analysis described here can be performed using standard spreadsheet functions. See, for example Media:CCI 40gr HV 100yd.xlsx or any of the other workbooks linked in the Examples.
