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Re: st: Generation of Variables with reference to values in the same column
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Generation of Variables with reference to values in the same column
Date
Fri, 14 Sep 2012 07:00:37 +0100
None of your commands is legal, but it is possible to guess at what
you did. As you evidently have time series data you should read up
about -tsset- and time series operators.
Nick
On 14 Sep 2012, at 06:40, Arnold Patrick Behrer <[email protected]>
wrote:
Hello,
Is there an easy way to generate a variable that measures the change
in a given column? Specifically I want to create a variable that is
equal to:
log(CPIt) - log(CPIt-1)
I tried using the following code:
generate log(CPI[2])-log(CPI[1])
But that simply filled the column with the results of the function
using the values of CPI in rows 1 & 2. Short of doing that manually
for each row, is there a way to write something like:
generate log(CPI[X]) - log(CPI[X-1])
That just goes down the column and calculates for each new row?
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