Velocities for 82 Galaxies
A numeric vector of velocities in km/sec of 82 galaxies from 6
well-separated conic sections of an
unfilled survey of the Corona
Borealis region. Multimodality in such surveys is evidence for voids
and superclusters in the far universe.
There is an 83rd measurement of 5607 km/sec in the Postman
et al. paper which is omitted in Roeder (1990) and from the
There is also a typo: this dataset has 78th observation 26690 which
should be 26960.
Roeder, K. (1990) Density estimation with confidence sets exemplified
by superclusters and voids in galaxies.
Journal of the American Statistical Association 85, 617–624.
Postman, M., Huchra, J. P. and Geller, M. J. (1986)
Probes of large-scale structures in the Corona Borealis region.
Astronomical Journal 92, 1238–1247.
Venables, W. N. and Ripley, B. D. (2002)
Modern Applied Statistics with S. Fourth edition. Springer.
gal <- galaxies/1000
c(width.SJ(gal, method = "dpi"), width.SJ(gal))
plot(x = c(0, 40), y = c(0, 0.3), type = "n", bty = "l",
xlab = "velocity of galaxy (1000km/s)", ylab = "density")
lines(density(gal, width = 3.25, n = 200), lty = 1)
lines(density(gal, width = 2.56, n = 200), lty = 3)
Dataset imported from https://www.r-project.org.