Calculates the directional (circular) statistics of a sample of directional measurements for the 2D case (just the dip direction or strike).
dir_stats_2D(x, dir = 1, conf.level = 0.95)
| x | A vector of angular measurements in degrees |
|---|---|
| dir | A logical indicating if the data are directional (1) or non-directional (0) |
| conf.level | Confidence level to use for the cone of confidence (Default is 0.95) |
A data frame with the mean direction, mean resultant length, circular variance, concentration parameter, and cone of confidence
Directional data refers to dipping planes or lines, data expressed as dip direction (trend). Non-directional data refers to strike or lineations expressed as azimuths that can take two angles (i.e. 45 or 225)
Davis, J. C. (2002). Statistical and Data Analysis in Geology. 3rd ed. John Wiley & Sons.
Swan, A. R. H. & Sandilands, M. (1995). Introduction to Geological Data Analysis. Blackwell Science.
Borradaile, G. (2003). Statistics of Earth Science Data. Springer.
x <- c(255, 239, 222, 231, 199, 271, 222, 274, 228, 246, 177, 199, 257, 201, 237, 209, 216) dir_stats_2D(x)#> Mean.Dir R Circ.Var Conc.Param Cone.lower Cone.upper Cone #> 1 228.4 0.8996 0.1004 5.271 215.9 240.9 12.51# non-directional data example dir_stats_2D(carolina, dir = 0)#> Mean.Dir R Circ.Var Conc.Param Cone.lower Cone.upper Cone #> 1 48.7 0.9823 0.0177 28.5 47.6 49.8 1.07