Question: 2. A failed attempt at a consistent estimator: Box et al. (2008) suggest only n/4 correlations should be estimated. Modify the periodogram code to use

2. A failed attempt at a consistent estimator: Box et al. (2008) suggest only n/4 correlations should be estimated. Modify the periodogram code to use only floor(n/4) instead of n–1 terms, thus using only “reliable” correlations: ̂p( f ) =

Ĉ 0 + 2Σ

floor(n∕4)

k=1 Ĉ kcos(2????kf ). Use the sunspot data. Notice any issues?

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