rotations (version 0.1)

nickel: Nickel electron backscatter diffraction data set

Description

This data set consists of electron backscatter diffraction (EBSD) data obtained by scanning a fixed 12.5 $\mu$m-by-10 $\mu$m nickel surface at individual locations spaced 0.2 $\mu$m apart. This scan was repeated 14 times for each of the 3,449 locations yielding a total of 48,286 observations. Every observation corresponds to the orientation, expressed as a rotation matrix, of a cubic crystal on the metal surface at a particular location. Be aware that there are missing values and erroneous scans at some locations and scans. See Bingham et al. (2009) and Bingham et al. (2010) for more details and analysis.

Usage

data(nickel)

source

The data set was collected by The Ames Lab located in Ames, IA.

References

Bingham, M. A., Nordman, D., & Vardeman, S. (2009). "Modeling and inference for measured crystal orientations and a tractable class of symmetric distributions for rotations in three dimensions." Journal of the American Statistical Association, 104(488), pp. 1385-1397.

Bingham, M. A., Lograsso, B. K., & Laabs, F. C. (2010). "A statistical analysis of the variation in measured crystal orientations obtained through electron backscatter diffraction."" Ultramicroscopy, 110(10), pp. 1312-1319.

Examples

data(nickel)
Rep1<-nickel[nickel$rep==1,]
qplot(xpos,ypos,data=Rep1,colour=v1,size=I(2))