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

Charles R Harris charlesr.harris@gmail....
Thu Nov 5 23:00:03 CST 2009


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
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