Quasar Photometric Redshifts and Candidate Selection The photometric redshift (photo-z) estimation code: photoz The candidate selection code: classification Code Description The photo-z and classification code is written in R language (https://cran.r-project.org). The code depends on R packages, including sn, mvtnorm, pracma, data.table and bit64. To install a R package, for example sn, please run install.packages("package_name") in R. To run a .R file, please run source("filename.R") in R. The flux in the input files are calculated via IDL codes in the get_flux directory. Photo-z results The SDSS, SDSS-WISE, PS1-WISE, and DECaLS-WISE photo-z results are in files in the photoz/result directory. SDSS: photoz_SDSS.csv.zip SDSS-WISE: photoz_skewt_SDSS_WISE.csv.zip PS1-WISE: photoz_skewt_PS1_WISE.csv.zip DECaLS-WISE: photoz_skewt_DECaLS_WISE.csv.zip Photometric quasars in the SDSS Stripe 82 region In region 340< R.A.<45 deg and −1.25<Decl.<1.25 deg (roughly b < −50 deg). Photometry used: DECaLS (DR3) and unWISE photometry. File: catalog/photoz_qso_S82.fits Reference https://arxiv.org/abs/1710.09155 Contact Any question please fell free to contact Qian (qianyang.astro@gmail.com)