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Let St represent the monthly sales data listed in sales.dat (n = 150),and let Lt be the leading indicator listed in lead.dat. Fit the regressionmodel

Let St represent the monthly sales data listed in sales.dat (n = 150),and let Lt be the leading indicator listed in lead.dat. Fit the regressionmodel St = 0 + 1Lt3 + xt, where xt is an ARMA process.

R commands for retrieving data:

>install.packages("astsa") >library(astsa) >data(sales)

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