As web-based and other electronic data collection methods become more widely used in research, the opportunities to use statistical software in conjunction with conventional database systems are increasing. Among such systems, MySQL is particularly well suited for research purposes. For example,...

While Stata has gained wide acceptance in academia, its use in corporate environments lags far behind. For academic Stata users, the product's inability to penetrate business has important consequences. Students trained in Stata have fewer opportunities than those trained in other tools,...

With its suite of ODBC-related commands, Stata may now be used directly with many popular database management systems (DBMSs) and other ODBC data sources. Stat/Transfer's ODBC capabilities have permitted indirect access for some time. ODBC has advantages over copy-and-paste or save-as/insheet...

Liang and Zeger's original formulation of generalized estimating equations (GEE) has been widely applied since its introduction in 1986 because it extends the application of generalized linear models to clustered data. In this presentation we discuss a method, quasi-least squares (QLS), that is...

xtgraph produces summary graphs of xt data, by time and by group. It is very flexible, allowing means based on any power or 3-parameter log transformation, and error bars for SE, CI, SD and Reference Range, as well as medians with IQR. Normally, points are estimated separately for each level of...

The Stata program triplot produces a triangular plot of three variables with constant sum. Most commonly, three fractions or proportions add to 1, or three percents add to 100. The constant sum constraint means that there are just two independent pieces of information. Hence, it is possible to...

Graded data are those possessing an inherent order but falling short of a metric scale. Examples are opinions on a five-point scale, such as strongly disagree, disagree, neutral, agree, strongly agree. Graded data are, like ranked data, one kind of ordinal data. They are common in many fields,...

At the UK Stata User's Group meeting in 2000, we presented a series of linked commands which made it possible to declare exposure, stratifying and confounding variables, and to combine this information with Stata estimation commands such as regress, logistic, poisson, stcox, xtpois, etc., to...

These minutes summarize StataCorp president Bill Gould's remarks in a Report to Users, and a "Wishes and Grumbles" session in which users made suggestions to Messrs Gould and Gutierrez.

At the first German Stata Users Group meeting, Hildegard Schaeper raised the issue of tabulating multiple response sets with Stata. Hildegard presented two of her own programs to deal with multiple responses and identified a number of remaining problems. In my contribution, I will re-address the...