Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: st: How to set a year index?


From   Nick Cox <n.j.cox@durham.ac.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
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 
n.j.cox@durham.ac.uk 

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?

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index