SDSS_ptsrc_test {astrodatR}

Sloan Digital Sky Survey point source photometry: Test sample

Description

Together with SDSS_ptsrc_train, these two datasets are designed to exercise methods of supervised classification in low dimensions. The datasets are extracted from the very large (~300 million) Sloan Digital Sky Survey in five photometric bands (ugriz). See York et al. (2000) and http://en.wikipedia.org/wiki/Sloan_Digital_Sky_Survey for background on the survey. The SDSS_test sample has four color indices (u-g, g-r, r-i, i-z) for 12884 unclassified point sources from the 5th Data Release. The SDSS_train sample has the four color indices together with known classes for 9000 well-characterized Sloan point sources: 2000 quasars (Class 1), 5000 main sequence and giant stars (Class 2), and 2000 white dwarfs (Class 3). The references, extraction and pre-processing necessary to obtain these samples are described in Appendix C.9 of Feigelson & Babu (2012). Application of statistican and machine learning classification methods area given in Chapter 9.

Usage

SDSS_ptsrc_test

Format

Table SDSS_ptsrc_test contains 12,884 rows and 4 columns with header row. No missing or censored data are present.

Source

Feigelson and Babu (2012), York et al. (2000)

References

Feigelson, E. D. and Babu, G. J. (2012) Modern Statistical Methods for Astronomy with R Applications, Cambridge UK:Cambridge University Press

York, D. G., Adelman, J., Anderson, J. E., Anderson, S. F., Annis, J., and 140 others (2000) The Sloan Digital Sky Survey: Technical Summary, Astronomical Journal, 120, 1579-1587 http://adsabs.harvard.edu/abs/2000AJ....120.1579Y