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RE: st: How to set a year index?
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
RE: st: How to set a year index?
Date
Fri, 20 May 2011 15:58:57 +0100
The logic here is fine, but why do it this way?
summarize price if year == 2005, meanonly
gen price_index = price/r(mean)
Note how
1. The middle macro is completely unnecessary.
2. Although it will not usually bite, you are probably losing a smidgen of precision by using a local.
3. Specifying -meanonly- is efficient if all you need is the mean.
Small points indeed, but in computing the devil is often in the details.
Nick
[email protected]
Oliver Jones
for example if you had a variable called price you could do
summarize price if year == 2005
local base_value = `r(mean)'
gen price_index = price/`base_value'
Am 20.05.2011 16:43, schrieb Barbara Engels:
> I have a time series from 1990 to 2010 and want to set the year 2005 as an index year (2500=100) so as to evaluate the other observations with reference to 2005. How can I do that with Stata commands?
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