Forums

Histogram and periodogram

Started by HardySpicer July 10, 2009
Are they the same? Also, I read that the Periodogram can be used be
used for Probability Mass Function (like PDF for discrete signals) but
this sounds a but dodgy.


Hardy
On 10 Jul, 07:52, HardySpicer <gyansor...@gmail.com> wrote:
> Are they the same?
No. A histogram just counts the occurences of a value (or interval of values) in a data set. There is no information perserved about the sequence the values occur in the data.
> Also, I read that the Periodogram can be used be > used for Probability Mass Function (like PDF for discrete signals) but > this sounds a but dodgy.
Well, the periodogram says something about where in the spectrum you tend to find energy. In that respect, it might be viewed as some sort of PDF. I would be very careful about taking any such analogies very literally, though. As always, such analogies are only useful up to a certain point. Past that point, they become counterproductive. Rune
On Jul 9, 11:06&#2013266080;pm, Rune Allnor <all...@tele.ntnu.no> wrote:
> On 10 Jul, 07:52, HardySpicer <gyansor...@gmail.com> wrote: > > > Are they the same? > > No. A histogram just counts the occurences of a value > (or interval of values) in a data set. There is no > information perserved about the sequence the values > occur in the data. > > > Also, I read that the Periodogram can be used be > > used for Probability Mass Function (like PDF for discrete signals) but > > this sounds a but dodgy. > > Well, the periodogram says something about where > in the spectrum you tend to find energy. In that > respect, it might be viewed as some sort of PDF. > > I would be very careful about taking any such > analogies very literally, though. As always, such > analogies are only useful up to a certain point. > Past that point, they become counterproductive. > > Rune
Well, if you have white noise the PDF is guassian (say) but the periodogram is flat. Hardy
HardySpicer wrote:
> On Jul 9, 11:06 pm, Rune Allnor <all...@tele.ntnu.no> wrote: >> On 10 Jul, 07:52, HardySpicer <gyansor...@gmail.com> wrote: >> >>> Are they the same? >> No. A histogram just counts the occurences of a value >> (or interval of values) in a data set. There is no >> information perserved about the sequence the values >> occur in the data. >> >>> Also, I read that the Periodogram can be used be >>> used for Probability Mass Function (like PDF for discrete signals) but >>> this sounds a but dodgy. >> Well, the periodogram says something about where >> in the spectrum you tend to find energy. In that >> respect, it might be viewed as some sort of PDF. >> >> I would be very careful about taking any such >> analogies very literally, though. As always, such >> analogies are only useful up to a certain point. >> Past that point, they become counterproductive. >> >> Rune > > Well, if you have white noise the PDF is guassian (say) but the > periodogram is flat.
Well, if you have Gaussian white noise, the PDF is guassian (say) but the periodogram is flat. Jerry -- Engineering is the art of making what you want from things you can get. &#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;&#2013266095;
 
>> Well, if you have white noise the PDF is guassian (say) but the >> periodogram is flat. > >Well, if you have Gaussian white noise, the PDF is guassian (say) but >the periodogram is flat. > >Jerry
%%% See the effect of my post :-) Chintan