Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
| From | Yuval Arbel <yuval.arbel@gmail.com> |
| To | David Greenberg <dg4@nyu.edu> |
| Subject | Re: st: How do I demonstrate that a sample is randomly drawn from a population? |
| Date | Sun, 14 Apr 2013 14:14:07 -0700 |
David, thanks for your answer. As I noted in my question - I already tried the difference-of-mean test. I'm not sure, however, this is the appropriate test for the problem I presented (in your answer - you said the same thing in different words). My educated guess would be - that to demonstrate a random sample - I need to make some comparison between the population and sample distribution. The question would still be what exact test do I need - and what is the appropriate command in stata On Sun, Apr 14, 2013 at 1:56 PM, David Greenberg <dg4@nyu.edu> wrote: > Testing whether the mean of a sample is significantly different from the > mean of a population is a topic covered in every introductory statistics > book. However, even if the differences in means is not statistically > significant, you still have not demonstrated that the sample was, in fact, > randomly drawn from the given population. David Greenberg, Sociology > Department, New York University > > > On Sun, Apr 14, 2013 at 3:00 PM, Yuval Arbel <yuval.arbel@gmail.com> wrote: >> >> Dear statalisters, >> >> I have two files: >> >> 1) The first file contains the grades of all population of Open >> University students. >> >> 2) The second file contains the grades of Open University students, >> who filled a questionnaire via the net. >> >> I would like to show that the second file is a random sample drawn >> from the first file. >> >> The question is can I provide a statistical evidence that the sample >> is indeed random? what are the appropriate commands in stata? >> >> P.S. I thought to run the test of difference of means between two >> populations. Having reconsidered, however, I'm not talking here about >> two populations, but rather a sample,which is drawn from a given >> population. >> >> As always, your answers will be very much appreciated >> >> -- >> Dr. Yuval Arbel >> School of Business >> Carmel Academic Center >> 4 Shaar Palmer Street, >> Haifa 33031, Israel >> e-mail1: yuval.arbel@carmel.ac.il >> e-mail2: yuval.arbel@gmail.com >> * >> * 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/ > > -- Dr. Yuval Arbel School of Business Carmel Academic Center 4 Shaar Palmer Street, Haifa 33031, Israel e-mail1: yuval.arbel@carmel.ac.il e-mail2: yuval.arbel@gmail.com * * 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/