Multiple-key merges arise when more than one variable is required to uniquely identify the observations in your data. In Merging data, part 1, I discussed single-key merges such as
. merge 1:1 personid using ...
In that discussion, each observation in the dataset could be uniquely identified on the basis of a single variable. In panel or longitudinal datasets, there are multiple observations on each person or thing and to uniquely identify the observations, we need at least two key variables, such as Read more…
Between now and the end of the year, the annual Stata Conference in the United States will take place along with five other Stata meetings in countries around the world.
Stata conferences and meetings feature talks by both Stata users and Stata developers and provide an opportunity to help shape the future of Stata development by interacting with and providing feedback directly to StataCorp personnel.
The talks range from longer presentations by invited speakers to shorter talks demonstrating the use of Stata in a variety of fields. Some talks are statistical in nature while others focus on data management, graphics, or programming in Stata. New enhancements to Stata created both by users and by StataCorp are often featured in talks.
The full schedule of upcoming meetings is Read more…