[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


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

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