Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: sampling question

From   "ACHINTYA RAY" <>
To   <>
Subject   st: sampling question
Date   Wed, 10 Mar 2004 12:58:38 -0600

Sorry for posting a somewhat long query. I'll appreciate if you can help me
perform the following operation is Stata. Bootstrap commands in Stata helps
me perform some of the things. Specifically, I am looking for a solution
where (sort of) bootsrap is allowed within a bootstrap setup.

Suppose I have a sample of 20,000. I have 3 variables: y, x1 and x2.
Step 1: Draw 30 samples of size 100 each.
Step 2: Calculate mu(y), mu(x1), mu(x2) for each of the subsamples.
Step 3: Create a matrix of mu(y), mu(x1), mu(x2). Clearly, it will be a
matrix of dimension 30x3. Let's call it [Y X1 X2]
Step 4: Run the model Y=a + b1*X1 + b2*X2 + e
Step 5: Create file to save estimated b1 and b2.
Step 6: Repeat Steps 1 through 5 several times (100 times) to obtain a
matrix of estimated b1 and b2s (100x2 in dimension).

While I can create a grand file of all the means, I am having difficulty in
creating the subroutine described in Steps 1 through 5.


Achintya Ray
Senior Research Associate
Department of Medicine
Vanderbilt University

*   For searches and help try:

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