[Numpy-discussion] Comparing variable time-shifted two measurements
Gökhan Sever
gokhansever at gmail.com
Fri Nov 6 18:42:10 EST 2009
On Thu, Nov 5, 2009 at 11:00 PM, Charles R Harris <charlesr.harris at gmail.com
> wrote:
>
>
> On Thu, Nov 5, 2009 at 9:46 PM, Charles R Harris <
> charlesr.harris at gmail.com> wrote:
>
>>
>>
>> On Thu, Nov 5, 2009 at 7:21 PM, Gökhan Sever <gokhansever at 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.
>
> _______________________________________________
> NumPy-Discussion mailing list
> NumPy-Discussion at scipy.org
> http://mail.scipy.org/mailman/listinfo/numpy-discussion
>
>
--
Gökhan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/numpy-discussion/attachments/20091106/383b543a/attachment.html>
More information about the NumPy-Discussion
mailing list