Question
a. Perform the following transformation of the column `Cost`: Apply a log transform followed by a seasonal difference. Label the resulting time series Y. b.
a. Perform the following transformation of the column `Cost`: Apply a log transform followed by a seasonal difference. Label the resulting time series Y.
b. Apply the KPSS test to Y. What is its p-value? What can you conclude about Y?
c. Make a time plot of log(Cost). Why does the trend disappear when we consider Y?
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Calculus Early Transcendentals
Authors: William L. Briggs, Lyle Cochran, Bernard Gillett
2nd edition
321954428, 321954424, 978-0321947345
