# plot_RadialPlot

##### Function to create a Radial Plot

A Galbraith's radial plot is produced on a logarithmic or a linear scale.

##### Usage

```
plot_RadialPlot(data, na.rm = TRUE, log.z = TRUE, central.value,
centrality = "mean.weighted", mtext, summary, summary.pos, legend,
legend.pos, stats, rug = FALSE, plot.ratio, bar.col, y.ticks = TRUE,
grid.col, line, line.col, line.label, output = FALSE, ...)
```

##### Arguments

- data
data.frame or '>RLum.Results object (

**required**): for`data.frame`

two columns: De (`data[,1]`

) and De error (`data[,2]`

). To plot several data sets in one plot, the data sets must be provided as`list`

, e.g.`list(data.1, data.2)`

.- na.rm
logical (

*with default*): excludes`NA`

values from the data set prior to any further operations.- log.z
logical (

*with default*): Option to display the z-axis in logarithmic scale. Default is`TRUE`

.- central.value
numeric: User-defined central value, primarily used for horizontal centering of the z-axis.

- centrality
character or numeric (

*with default*): measure of centrality, used for automatically centering the plot and drawing the central line. Can either be one out of`"mean"`

,`"median"`

,`"mean.weighted"`

and`"median.weighted"`

or anumeric value used for the standardisation.

- mtext
character: additional text below the plot title.

- summary
character (

*optional*): add statistic measures of centrality and dispersion to the plot. Can be one or more of several keywords. See details for available keywords.- summary.pos
numeric or character (

*with default*): optional position coordinates or keyword (e.g.`"topright"`

) for the statistical summary. Alternatively, the keyword`"sub"`

may be specified to place the summary below the plot header. However, this latter option is only possible if`mtext`

is not used.- legend
character vector (

*optional*): legend content to be added to the plot.- legend.pos
numeric or character (with default): optional position coordinates or keyword (e.g.

`"topright"`

) for the legend to be plotted.- stats
character: additional labels of statistically important values in the plot. One or more out of the following:

`"min"`

,`"max"`

,`"median"`

.

- rug
logical: Option to add a rug to the z-scale, to indicate the location of individual values

- plot.ratio
numeric: User-defined plot area ratio (i.e. curvature of the z-axis). If omitted, the default value (

`4.5/5.5`

) is used and modified automatically to optimise the z-axis curvature. The parameter should be decreased when data points are plotted outside the z-axis or when the z-axis gets too elliptic.- bar.col
character or numeric (

*with default*): colour of the bar showing the 2-sigma range around the central value. To disable the bar, use`"none"`

. Default is`"grey"`

.- y.ticks
logical: Option to hide y-axis labels. Useful for data with small scatter.

- grid.col
character or numeric (

*with default*): colour of the grid lines (originating at`[0,0]`

and stretching to the z-scale). To disable grid lines, use`"none"`

. Default is`"grey"`

.- line
numeric: numeric values of the additional lines to be added.

- line.col
- line.label
character: labels for the additional lines.

- output
logical: Optional output of numerical plot parameters. These can be useful to reproduce similar plots. Default is

`FALSE`

.- ...
Further plot arguments to pass.

`xlab`

must be a vector of length 2, specifying the upper and lower x-axes labels.

##### Details

Details and the theoretical background of the radial plot are given in the
cited literature. This function is based on an S script of Rex Galbraith. To
reduce the manual adjustments, the function has been rewritten. Thanks to
Rex Galbraith for useful comments on this function.
Plotting can be disabled by adding the argument `plot = "FALSE"`

, e.g.
to return only numeric plot output.

Earlier versions of the Radial Plot in this package had the 2-sigma-bar
drawn onto the z-axis. However, this might have caused misunderstanding in
that the 2-sigma range may also refer to the z-scale, which it does not!
Rather it applies only to the x-y-coordinate system (standardised error vs.
precision). A spread in doses or ages must be drawn as lines originating at
zero precision (x0) and zero standardised estimate (y0). Such a range may be
drawn by adding lines to the radial plot ( `line`

, `line.col`

,
`line.label`

, cf. examples).

A statistic summary, i.e. a collection of statistic measures of centrality and dispersion (and further measures) can be added by specifying one or more of the following keywords:

`"n"`

(number of samples),`"mean"`

(mean De value),`"mean.weighted"`

(error-weighted mean),`"median"`

(median of the De values),`"sdrel"`

(relative standard deviation in percent),`"sdrel.weighted"`

(error-weighted relative standard deviation in percent),`"sdabs"`

(absolute standard deviation),`"sdabs.weighted"`

(error-weighted absolute standard deviation),`"serel"`

(relative standard error),`"serel.weighted"`

(error-weighted relative standard error),`"seabs"`

(absolute standard error),`"seabs.weighted"`

(error-weighted absolute standard error),`"in.2s"`

(percent of samples in 2-sigma range),`"kurtosis"`

(kurtosis) and`"skewness"`

(skewness).

##### Value

Returns a plot object.

##### Function version

0.5.5 (2018-08-03 10:46:47)

##### How to cite

Dietze, M., Kreutzer, S. (2018). plot_RadialPlot(): Function to create a Radial Plot. Function version 0.5.5. In: Kreutzer, S., Burow, C., Dietze, M., Fuchs, M.C., Schmidt, C., Fischer, M., Friedrich, J. (2018). Luminescence: Comprehensive Luminescence Dating Data Analysis. R package version 0.8.6. https://CRAN.R-project.org/package=Luminescence

##### References

Galbraith, R.F., 1988. Graphical Display of Estimates Having Differing Standard Errors. Technometrics, 30 (3), 271-281.

Galbraith, R.F., 1990. The radial plot: Graphical assessment of spread in ages. International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 17 (3), 207-214.

Galbraith, R. & Green, P., 1990. Estimating the component ages in a finite mixture. International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 17 (3) 197-206.

Galbraith, R.F. & Laslett, G.M., 1993. Statistical models for mixed fission track ages. Nuclear Tracks And Radiation Measurements, 21 (4), 459-470.

Galbraith, R.F., 1994. Some Applications of Radial Plots. Journal of the American Statistical Association, 89 (428), 1232-1242.

Galbraith, R.F., 2010. On plotting OSL equivalent doses. Ancient TL, 28 (1), 1-10.

Galbraith, R.F. & Roberts, R.G., 2012. Statistical aspects of equivalent dose and error calculation and display in OSL dating: An overview and some recommendations. Quaternary Geochronology, 11, 1-27.

##### See Also

##### Examples

```
# NOT RUN {
## load example data
data(ExampleData.DeValues, envir = environment())
ExampleData.DeValues <- Second2Gray(ExampleData.DeValues$BT998, c(0.0438,0.0019))
## plot the example data straightforward
plot_RadialPlot(data = ExampleData.DeValues)
## now with linear z-scale
plot_RadialPlot(data = ExampleData.DeValues,
log.z = FALSE)
## now with output of the plot parameters
plot1 <- plot_RadialPlot(data = ExampleData.DeValues,
log.z = FALSE,
output = TRUE)
plot1
plot1$zlim
## now with adjusted z-scale limits
plot_RadialPlot(data = ExampleData.DeValues,
log.z = FALSE,
zlim = c(100, 200))
## now the two plots with serious but seasonally changing fun
#plot_RadialPlot(data = data.3, fun = TRUE)
## now with user-defined central value, in log-scale again
plot_RadialPlot(data = ExampleData.DeValues,
central.value = 150)
## now with a rug, indicating individual De values at the z-scale
plot_RadialPlot(data = ExampleData.DeValues,
rug = TRUE)
## now with legend, colour, different points and smaller scale
plot_RadialPlot(data = ExampleData.DeValues,
legend.text = "Sample 1",
col = "tomato4",
bar.col = "peachpuff",
pch = "R",
cex = 0.8)
## now without 2-sigma bar, y-axis, grid lines and central value line
plot_RadialPlot(data = ExampleData.DeValues,
bar.col = "none",
grid.col = "none",
y.ticks = FALSE,
lwd = 0)
## now with user-defined axes labels
plot_RadialPlot(data = ExampleData.DeValues,
xlab = c("Data error (%)",
"Data precision"),
ylab = "Scatter",
zlab = "Equivalent dose [Gy]")
## now with minimum, maximum and median value indicated
plot_RadialPlot(data = ExampleData.DeValues,
central.value = 150,
stats = c("min", "max", "median"))
## now with a brief statistical summary
plot_RadialPlot(data = ExampleData.DeValues,
summary = c("n", "in.2s"))
## now with another statistical summary as subheader
plot_RadialPlot(data = ExampleData.DeValues,
summary = c("mean.weighted", "median"),
summary.pos = "sub")
## now the data set is split into sub-groups, one is manipulated
data.1 <- ExampleData.DeValues[1:15,]
data.2 <- ExampleData.DeValues[16:25,] * 1.3
## now a common dataset is created from the two subgroups
data.3 <- list(data.1, data.2)
## now the two data sets are plotted in one plot
plot_RadialPlot(data = data.3)
## now with some graphical modification
plot_RadialPlot(data = data.3,
col = c("darkblue", "darkgreen"),
bar.col = c("lightblue", "lightgreen"),
pch = c(2, 6),
summary = c("n", "in.2s"),
summary.pos = "sub",
legend = c("Sample 1", "Sample 2"))
# }
```

*Documentation reproduced from package Luminescence, version 0.8.6, License: GPL-3*