The models employ 34 years of monthly time series of sea ice, SST and atmospheric variables. (arcus.org)
Matsuura, K. and Willmott, C. J. (2009) «Terrestrial Air Temperature: 1900 - 2010 Gridded Monthly Time Series (Version 3.01)». (mpra.ub.uni-muenchen.de)
One such monthly time series represents the returns of ten portfolios formed by sorting the universe by each stock's ratio of book equity to market value and splitting them evenly into deciles. (euclidean.com)