The book ""The Interpolation of Time Series by Related Series"" by Milton Friedman is a comprehensive guide to the mathematical techniques used in time series analysis. The book covers topics such as interpolation, regression, and correlation, as well as more advanced topics like spectral analysis and autoregression. The author explains how these techniques can be used to analyze and predict trends in time series data, and provides numerous examples and case studies to illustrate their practical applications. The book is aimed at advanced students and professionals in the fields of economics, statistics, and finance, but is also accessible to anyone with a basic understanding of mathematical concepts. Overall, ""The Interpolation of Time Series by Related Series"" is an invaluable resource for anyone interested in understanding and analyzing time series data.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.