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st: High-pass filters


From   Linah Ababneh <linah@ltrr.arizona.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: High-pass filters
Date   Mon, 27 Jun 2005 18:19:01 -0700

Dear list members: 
I am fairly new to the use of stata in time series analysis. I would like to 
run a high pass filter on tree ring time series data set (for the past 1000 
years) to maintain any variance in the data below 7 years. In matlab, there is 
a function to specify the frequency, is there something similar in STATA? I 
ran the function 
-tssmooth nl newvariable = variable name, smoother(7) 

but i am not sure of the results. The function seems to average every 7 years 
together rather than taking all variance above 7 years. 

Any suggestions are highly appreciated and many thanks in advance, 
Linah 


 
-- 
Linah Ababneh 
Doctoral Candidate (Geosciences Dept. & LTRR)
The University of Arizona 
1629 E. University Blvd. 
Tucson, AZ 85721-0092 

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