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How to merge and append datasets using Stata?
How to merge two datasets?
How do I use _merge in Stata?
What is the Stata command for many-to-many merge?
merge is for adding new variables from a second dataset to existing observations. You use merge, for instance, when combining hospital patient and discharge datasets. If you wish to add new observations to existing variables, then see [D] append. You use append, for instance, when adding current discharges to past discharges.
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Mar 11, 2024 · Table of Contents. 1. Merge. 2. Append. 3. Useful Resources. 1. Merge. - We use merge to add variables to a dataset. - Merging two datasets requires that both have at least one variable in common (either string or numeric), which is also called the identifier variable. - The common variables or the identifier variables must have the same name.
- Appending Data Files
- Match Merging
- One-To-Many Match Merging
- Summary
When you have two data files, you may want to combine them by stacking them one on top of the other. For example, we have a file containing dads and a file containing momsas shown below. If we wanted to combine these files by stacking them one atop the other, we can use the appendcommand as shown below. We can use the listcommand to see if this wor...
Another way of combining data files is match merging. Say that we wanted to combine the dads with the famincdata file, having the dads information and the family information side by side. We can do this with a match merge. Let’s have a look at the dads and famincfile. We want to combine the data files so they look like this. Notice that the famid v...
Another kind of merge is called a one to many merge. Our one to one merge matched up dads and faminc and there was a one to one matching of the files. If we merge dads with kids, there can be multiple kids per dad and hence this is a one to manymerge. As you see below, the strategy for the one to many merge is really the same as the one to onemerge...
Appending data example Match merge example steps (one-to-one and one-to-many) Match merge example program
In order to merge two datasets, we need a common variable (or a set of variables) called a ‘key’ variable present in both the master and using file. In this case, it is year. We can merge the data using the menu option provided in the following sequence: Data > Combine datasets > Merge two datasets.
- Ayesha Irfan
- 15 min
Make sure one dataset is loaded into Stata (in this case mydata1), then use merge. Make sure to map where the using data is located (in this case mydata2, for example “c:\folders\data\mydata2.dta”)*. NOTE: For Stata 10 or older: Remove the 1:1 . Sort both datasets by all the ids and save before merging . PU/DSS/OTR.
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Feb 7, 2023 · Library Guides. Data Analysis with Stata. merge/append. Data Analysis with Stata. Combining Datasets. Information to be analyzed is usually scattered across multiple datasets. Stata opens only one dataset at a time. Therefore, you will quickly find that you need to combine datasets in order to analyze the information contained within.
