SDSS_ptsrc_test {astrodatR}R Documentation

Sloan Digital Sky Survey point source photometry: Test sample


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 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.




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


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


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

[Package astrodatR version 0.1 Index]