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This research concerns multiple regression for survey imputation, when correlation with a given regressor may vary radically over time, and emphasis may shift to other regressors. There may be many applications for this methodology, but here we will consider the imputation of generation and fuel consumption values for electric power producers in a monthly publication environment. When imputation is done by regression, a sufficient amount of good-quality observed data from the population offatcat:6dv4hshmmvdx5jraquxli6nbce