Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

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

# st: Calculating proportional growth rate in stata and do-it files

 From Georgia LockwoodEstrin To statalist@hsphsun2.harvard.edu Subject st: Calculating proportional growth rate in stata and do-it files Date Wed, 3 Oct 2012 00:08:01 +0100

```Hello there,
I have been trying to calculate the proportional/relative growth rate (rate
of brain growth with age) - to do this i have:
1. logged the dependent variable (I.e. brain growth)
2. regressed against age (and another independent variable).
3. predicted yhat (predicted y values)
4. tabstat yhat, by(age) - to get the yhat values for x1 and x2 (formula
below)
4. put yhat values into the equation below to get proportional rate of
growth

% proportional growth rate = ((yhat x2 - yhat x1)/ (x2-x1)) * 100
where x2 is oldest age and x1 is youngest age

However, i am wondering if this is the most efficient way to calculate the
proportional rate of growth - as I have a lot of these rates of growth to
get through, and it seems very  long way of calculating it? Perhaps it is
possible to put this all into a do -it file? in which case how to i program
stata to do the above calculated for each of my different variables?

Thanks!
Georgia
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/
```

© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index