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

Charles R Harris charlesr.harris@gmail....
Thu Nov 5 22:46:20 CST 2009


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.

Chuck
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