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st: calculating the difference in logs
From
"Data Analytics Corp." <[email protected]>
To
[email protected]
Subject
st: calculating the difference in logs
Date
Thu, 12 Jul 2012 08:47:20 -0400
Hi,
Suppose I have a time series on annual sales. I'd like to calculate the
year-over-year percent change using the difference in the natural logs.
I tried
g pct = d.ln(sales)
but I got an error message "unknown function d.ln()"
Then I tried
g logg = ln(sales)
g pct = d.logg
and I got the right answer. I'd like to use just the one line statement
as in the first example. Can this be done? Am I missing something? It
seems that it should work.
Thanks,
Walt
________________________
Walter R. Paczkowski, Ph.D.
Data Analytics Corp.
44 Hamilton Lane
Plainsboro, NJ 08536
________________________
(V) 609-936-8999
(F) 609-936-3733
[email protected]
www.dataanalyticscorp.com
_____________________________________________________
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