Talk:Periodogram

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Raw periodogram limitations[edit]

"The raw periodogram is not a good spectral estimate because of spectral bias and the fact that the variance at a given frequency does not decrease as the number of samples used in the computation increases."

  1. spectral bias is unresolved. Is that the same as Spectral leakage?
  2. Why does the variance at a given frequency not decrease as the # of samples increases?

—Preceding unsigned comment added by Dfrankow (talkcontribs) 22:33, 18 March 2009 (UTC)

Needs research[edit]

It would be nice to track down the original source instead of referencing a reference. I unfortunately don't have time to make for this, since I am less interested in mathematics than applications. The Welch method also needs some research. -rs2 17:25, 24 Mar 2004 (UTC)

difference between periodogram and spectrum?[edit]

It would be nice to see an explanation of why the term "periodogram" is used to refer to a technique that, in practice, estimates power density with respect to frequency instead of with respect to period.. 146.6.201.180 (talk) 19:17, 20 January 2010 (UTC)

It's simply because around the turn of the century, the word for a periodic function was "periodic", not "frequent".....so people searched for "periodicities", not "frequencies". And they still do. Andersen has, indeed, plumped for renaming the periodogram the "spectrogram" but this has not caught on.98.109.227.161 (talk) 20:07, 8 November 2012 (UTC)