# Histogram and periodogram

Started by 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
```