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 on April 23, and its replacement, is already up and running.

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

Re: st: semi-random sampling

From   Steven Samuels <>
Subject   Re: st: semi-random sampling
Date   Sun, 7 Aug 2011 01:08:26 -0400

The following code shows how to take a 10% sample within categories formed by two variables. The sample and whole population percentages will be approximately the same, with the agreement better for larger within-cell sample sizes.


*************CODE BEGINS*************
sysuse auto, clear
expand 6
set seed 842655
recode rep78 1/2=5 .=5
tab rep78 foreign, cell
sample 10, by(foreign rep78)
tab rep78 foreign, cell
**************CODE ENDS**************

On Aug 6, 2011, at 4:23 PM, Ekaterina Hertog wrote:

Dear all,
I need to take a subsample of observations from a big dataset making sure that the people in the subsample have a given geographic and age profile. I need to make sure that, say, 50% of people in the subsample come from the capital and 50% from other towns. Within each of these 2 locations I want to preserve a certain age structure: say in a city: 3 people ages 23, 4 people aged 24 …
Within those geographic and age profiles I want to select the observations randomly. Is it possible to do that in Stata 11? Any thoughts on how I would go about it?

*   For searches and help try:

© Copyright 1996–2015 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index