solution

 

. The consumer loans data used in Exercises 13.17 and 13.18 are not seasonally adjusted (NSA). If we assume that the Federal Reserve used seasonality factors to seasonally adjust the time series, then we can recover approximate seasonality factors. The adjusted series is provided for you in a data file. DATADATA

DATADATADATA

DATADATADATADATADATA

DATADATADATADATADATA

DATADATADATADATADATA

DATADATADATADATADATA

DATADATADATADATADATA

DATADATADATADATADATA

DATADATADATA

DATADATADATADATADATA

DATA FILE

ADJUSTEDLOANS

(a) Using software, create a new variable called “Approximate SF” by dividing the unadjusted data values by the adjusted data

values for each of the 107 months in the time series.

(b) Make a time plot of the Approximate SF series. Do you observe a regular, repeating pattern? If you observe a seasonal pattern, clearly describe the pattern.