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adjusted Automobile Production autoregressive model bituminous coal Bituminous Coal Production business activity business index Business Week Index canonical forms COHERENCE BETWEEN sTEEL computed concept considered Construction Contracts Let correlogram cross products cycle damped demand economic equation frequency components gain and phase HARMONIC MODELS high frequency Identification number input Interindustry J. W. Tukey Julius Bartels Kendall Kendall's Series LEAD measure moving average observed obtained ORDER AUTOREGRESSIVE MODELS original data output peak period periodogram phase angle Phase in Weeks physical units points Price of Steel price series problem production and construction production series Q Q Q radians relationships Second Order Autoregressive shown in Figure similar spectra spectral analysis spectral density spectral estimates spectrum Stationary Statistics steel and coal steel industry steel production structural suggests Table Tons transfer function values weighting function zero frequency