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

st: bags of marbles


From   David Airey <david.airey@vanderbilt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: bags of marbles
Date   Sun, 27 Jun 2004 17:42:59 -0500

This is probably an easy question for some, but it's giving me a headache.

I have N white bags and N black bags filled with 1000 marbles each. Marbles comes in 10 colors. There is bag to bag variation in the proportion of each color marble in a bag, and an unknown white and black bag treatment effect on the distribution of proportions of marbles. I only get to sample X marbles per bag.

We have a biological problem that is analogous to this. Scientists have analyzed these data by ignoring bag variation and just focusing on numbers of marbles sampled from white versus black.

I think this is not a good idea, but what is an appropriate Stata estimator that accounts for the bag to bag random effect, the white and black fixed effect, and models the count/categorical/proportion of marbles as dependent variable?

-Dave

*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* 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   |   What's new   |   Site index