A complex survey involves collection of data in stages (single-stage or multiple-stage designs), drawn from different strata or clusters of the population. We use Stata statistical package for analyzing survey data. Stata has a powerful set of tools to do survey analyses that takes into account the multi-stage and/or clustering nature of the data.
There are fourteen (14) open PhD positions in methodological research in diagnostic/prognostic and therepeutic studies and meta analysis. The positions are available at different sites accross Europe. Open to any nationals. Deadline is April 25, 2012, position begins in May or September 2012.
It took me a little while to write something about admissions into a Canadian university, but I won’t leave the opportunity to share my opinion on questions that I have encountered an uncountable number of times. The purpose of this article is to share with the interested students about my school—Western University, and the city of London, Ontario--the city I am currently living in. But before that, let me tell you how to become successful in getting admission into a graduate school in Canada.
I was asked if we can do the test of equality of two population variances using Stata. Well, I did not have to do it myself ever, but yes, it is possible to do it. Here is an example. I've just made-up the data to show the procedures.
Suppose we have the following data where the variables may represent two independent samples taken from normally distributed populations. And we want to test if the population variances of the two populations are the same. We will use the sample variances to do the testing.
This is yet another experiment to see how good is the approximation of binomial probability when we use Poisson and normal distributions for scenarios with large $n$, and $p$ close to zero or one.
Consider a problem where the random variable $X$ follows a binomial distribution with a known probability of success $p$, and number of trials $n$. If $n$ becomes large, it may not be possible to calculate the probabilities by hand calculation or using a calculator.
We can approximate the binomial distribution with a normal distribution or a Poisson distribution.
The article outlines the steps required to make a stata graph template or stata scheme. Stata schemes control how a particular graph will look like in terms of color, line styles, and all other aesthetic aspects.
