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The sales time series BJsales and leading indicator BJsales.lead each contain 150 observations. The objects are of class "ts".
BJsales
BJsales.lead
"ts"
BJsales BJsales.lead
G. E. P. Box and G. M. Jenkins (1976): Time Series Analysis, Forecasting and Control, Holden-Day, San Francisco, p.537.
P. J. Brockwell and R. A. Davis (1991): Time Series: Theory and Methods, Second edition, Springer Verlag, NY, pp.414.