The Carolina Population Center is a SAS shop, and its 25 programmers have long favored SAS for data management. Its research faculty, however, encourage the use of Stata to adjust for survey sampling effects. In an effort to introduce both SAS programmers and students to Stata, we wrote a...

We use Stata's npnchi2 and nchi2 functions to calculated power and required sample size for case-control studies. Following the method described by Self et al (1992) a large exemplary data set with expected risk factor frequencies among cases and controls under any alternative hypothesis is...

Introduction and overview of the technical aspects of building a collection of programs for Stata. In particular we will focus on the collection of programs developed for non-linear measurement error models to be presented at the workshop following the users group meeting.

We manage a longitudinal research data bank containing 3,000 variables that adds 25,000 observations per year. Data are batch converted from SQL to Stata on a daily basis, resulting in the creation of 20 preliminary data sets. We then use Stata to quality control the data and to prepare a single...

Binary response variables arise in a variety of studies. It is often of interest to summarize a treatment effect in terms of the difference in proportions of successes between groups. Stata produces the Wald-type asymptotic CI for differences in proportions in -cs- and -glm , family(binomial)...

Bowie State University requires a software course in their 3-course research sequence. The course covers descriptive and inferential statistics and some data management using Stata and SPSS syntax. The professor provides a diskette with the datasets and all class syntax files and a course...

Earlier studies based on the analyses of data from the Third International Mathematics and Science Study (TIMSS) identified an interesting but conflicting finding for the effects of three self-perception measures on students' achievement in the two subjects at two different levels:...

Stata's xi command performs dummy (indicator) coding on the fly and with the "*" operator allows for the interaction of two categorical variables or a categorical with a continuous variable. xi3 extends the capabilities of xi to include a number of additional coding systems and can create...

Stata is a general purpose statistical package with especially strong data manipulation and regression modeling capabilities. It appears to be especially strong in statistical techniques used by econometricians and biostatisticians. As psychologists, among others, adopt it, certain relative...

We discuss instrumental variables (IV) estimation in the broader context of the generalized method of moments (GMM), and describe an extended IV estimation routine that provides GMM estimates as well as additional diagnostic tests. Stand-alone test procedures for heteroskedasticity,...