Effects of averaged periodogram (Welch's Method) on resolution?

1. What are the main advantages of using the Welch method instead of the traditional periodogram?
2. What is averaged periodogram?
3. What is the purpose of a periodogram?
4. What are the different methods available to estimate power spectral density?

What are the main advantages of using the Welch method instead of the traditional periodogram?

Welch's method is an improvement on the standard periodogram spectrum estimating method and on Bartlett's method, in that it reduces noise in the estimated power spectra in exchange for reducing the frequency resolution.

What is averaged periodogram?

The method of averaged periodograms, more commonly known as Welch's method, divides a long x[n] sequence into multiple shorter, and possibly overlapping, subsequences.

What is the purpose of a periodogram?

A periodogram is used to identify the dominant periods (or frequencies) of a time series. This can be a helpful tool for identifying the dominant cyclical behavior in a series, particularly when the cycles are not related to the commonly encountered monthly or quarterly seasonality.

What are the different methods available to estimate power spectral density?

The process of transforming from the time to the frequency domain is known as spectral estimation. Two methods are commonly used, the Fast Fourier Transform (FFT) and the Maximum Entropy Method (MEM).