[Numpy-discussion] Comparing variable time-shifted two measurements

Gökhan Sever gokhansever@gmail....
Fri Nov 6 17:42:10 CST 2009


On Thu, Nov 5, 2009 at 11:00 PM, Charles R Harris <charlesr.harris@gmail.com
> wrote:

>
>
> On Thu, Nov 5, 2009 at 9:46 PM, Charles R Harris <
> charlesr.harris@gmail.com> wrote:
>
>>
>>
>> On Thu, Nov 5, 2009 at 7:21 PM, Gökhan Sever <gokhansever@gmail.com>wrote:
>>
>>> Hello,
>>>
>>> I have two aircraft based aerosol measurements. The first one is
>>> dccnConSTP (blue), and the latter is CPCConc (red) as shown in this screen
>>> capture. (http://img513.imageshack.us/img513/7498/ccncpclag.png). My
>>> goal is to compare these two measurements. It is expected to see that they
>>> must have a positive correlation throughout the flight. However, the
>>> instrument that gives CPCConc was experiencing a sampling issue and
>>> therefore making a varying time-shifted measurements with respect to the
>>> first instrument. (From the first box it is about 20 seconds, 24 from the
>>> seconds before the dccnConSTP measurements shows up.) In other words in
>>> different altitude levels, I have varying time differences in between these
>>> two measurements in terms of their shapes. So, my goal turns to addressing
>>> this variable shifting issue before I start doing the comparisons.
>>>
>>> Is there a known automated approach to correct this mentioned varying-lag
>>> issue? If so, how?
>>>
>>>
>> Can you be more explicit about the varying lags? Do you know what the lags
>> are? If not, how much information about them, such as range, probability,
>> etc., can you supply? Are there dropouts, or do the lags varying sort of
>> continuously? Can you parameterise the lags, so on and so forth.
>>
>>
> What does a straight forward scatter plot look like?
>
> Chuck
>
>
Here it goes for you

http://img44.imageshack.us/img44/1038/scatter.png

Both axes is in log-scale. X-axes being CPCConc, and the y is dccnConSTP.


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-- 
Gökhan
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