Mathematical formulation of periodogram built-in function

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I used periodogram(data, hamming, [], freq) to generate autospectrum of a data. Where do I find the mathematical model of the above function - I would like to know the mathematical expressions used in the above calculations to write my research work.
The sample of my code is here where turbw is the data.
[pww, fww] = periodogram(turbw, hamming(length(turbw)), [],freq);
pww = smooth(pww);
sm1 = floor(length(fww)/20);
pww(1:sm1) = smooth(pww(1:sm1));
pww(sm1:end) = smooth(pww(sm1:end));

Accepted Answer

Sai Veeramachaneni
Sai Veeramachaneni on 23 Mar 2020
You can find the required information here.

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