Nonlinear Processes in Geophysics www.nonlin-processes-geophys.net 1023-5809 1607-7946 14 1 2007 10.5194/npg-14-1-2007 http://www.nonlin-processes-geophys.net/14/1/2007/ http://www.nonlin-processes-geophys.net/14/1/2007/npg-14-1-2007.html http://www.nonlin-processes-geophys.net/14/1/2007/npg-14-1-2007.pdf 1 2 2007-01-15 Comment on "Spatio-temporal filling of missing points in geophysical data sets" by D. Kondrashov and M. Ghil, Nonlin. Processes Geophys., 13, 151–159, 2006 T. Schneider tapio@caltech.edu California Institute of Technology, Pasadena, CA, USA No abstract available. Beckers, J M. and Rixen, M.: EOF calculations and data filling from incomplete oceanographic datasets, J. Atmos. Oceanic Technol., 20, 1839–1856, 2003. Dempster, A P., Laird, N M., and Rubin, D B.: Maximum likelihood estimation from incomplete data via the EM algorithm (with discussion), J. Roy. Stat. Soc. B, 39, 1–38, 1977. Everson, R. and Sirovich, L.: Karhunen-Loève procedure for gappy data, J. Opt. Soc. Am. A, 12, 1657–1664, 1995. Fierro, R D., Golub, G H., Hansen, P C., and O'Leary, D P.: Regularization by truncated total least squares, SIAM J. Sci. Comput., 18, 1223–1241, 1997. Kondrashov, D. and Ghil, M.: Spatio-temporal filling of missing points in geophysical data sets, Nonlin. Processes Geophys., 13, 151–159, 2006. Little, R. J A. and Rubin, D B.: Statistical Analysis with Missing Data, Series in Probability and Mathematical Statistics, Wiley, New York, 2nd edn., 2002. Schneider, T.: Analysis of incomplete climate data: Estimation of mean values and covariance matrices and imputation of missing values, J. Climate, 14, 853–871, 2001.