Reference no: EM132851121
Please provide the R codes1 The data file Winnebago contains monthly unit sales of recreational vehicles (RVs) from Winnebago, Inc., from November 1966 through February 1972.
(a) Display and interpret the time series plot for these data.
(b) Now take natural logarithms of the monthly sales figures and display the time series plot of the transformed values. Describe the effect of the logarithms on the behavior of the series.
(c) Calculate the fractional relative changes, (Yt - Yt - 1)/Yt - 1, and compare them with the differences of (natural) logarithms,∇log(Yt) = log(Yt) - log(Yt - 1).
How do they compare for smaller values and for larger values?
(d) Based on (i) time plot, (ii) ACF plot, (iii) the ADF test, and (iv) PP test, determine if the series in (a), (b), and (c) are stationary. [Note: You can conduct an ADF test and a PP test can be conducted using "adf.test" and "pp.test" functions in "tseries" package in R.
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: Please provide the R codes1 The data file Winnebago contains monthly unit sales of recreational vehicles (RVs) from Winnebago, Inc., from November 1966 through
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