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RE: How to do time lag correlation in ferret?
Hello Yang
This is how I do lag and lead correlations.
Use the go file variance.jnl
! Define your variables to be correlated
let p = sst
let q = wind ! (or what ever the variable names are)
go variance
contour correl ! (contours the correlations)
This will give simultaneous correlations. To get lag and leads use the
transformation @shf when defining p or q. For example:
Let q = wind[L=@shf:5]
The 6th time step in the original time series of q now becomes the first
etc. Thus p (sst) leads q (wind) by 5 when you do the correlation. You
can use negative numbers also.
Mark Williams
Supervising Meteorologist
Ph 61 3 9669 4902
----------
From: Yang Haijun [SMTP:navyang@tuna.meteor.wisc.edu]
Sent: Wednesday, 05 January 2000 03:22
To: ferret_users@ferret.wrc.noaa.gov
Subject: How to do time lag correlation in ferret?
Hi, Dear Ferreters,
Have anyone done time lag correlation between two long term series data
set?
For example, I have two data SST and WIND with 50 years, I want to get
correlation coefficient
between SST and 5-year-later WIND, how can I do that?
Any suggestions are highly appreciated.
Haijun Yang
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