Explain the concept and utility of the autocovariance function and the autocorrelation function. Write down the corresponding equations that de_ne these concepts.    Suppose that you have a sample...

Explain the concept and utility of the autocovariance function and the

autocorrelation function. Write down the corresponding equations that de_ne

these concepts.

 Suppose that you have a sample realization of n observations given by

fx1 xng. Explain how you could estimate the autocovariance and sample

autocorrelation functions.