data: https://webwork.elearning.ubc.ca/webwork2_files/tmp/2017W2_STAT443_202/fil

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data: https://webwork.elearning.ubc.ca/webwork2_files/tmp/2017W2_STAT443_202/file34b02a4fde56.csv

Part (a) The time series exhibits a clear cyclical component. Based on the plot, make an estimate of the period of this cyclical effect, giving your answer to the nearest whole year Part (b) Use the R command spec.pgram to compute and plot the raw periodogram of the time series. At which frequency does the raw periodogram attain its maximum value? Give your answer to three decimal places. Note that the command which. max may help here. Part (c) To improve the estimate of the underlying spectrum, we can smooth the raw periodogram. The option spans applies one or more (Daniell) smoother(s) to the periodogram. Smooth your periodogram by setting spans = c(8, 10), which applies two filters in turn. At which frequency does the smoothed periodogram attain its maximum value? Give your answer to three decimal places Part (d) Using your smoothed periodogram, provide an estimate of the period of the underlying cyclical component. Give your answer to two decimal places.

Explanation / Answer

given link is not right. it showing something wrong so plese provide correct data set.

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