Can you merge on string variables in Stata?
Merging two datasets require that both have at least one variable in common (either string or numeric). If string make sure the categories have the same spelling (i.e. country names, etc.). The common variables must have the same name.
Can you merge on two variables Stata?
Easy: Stata can match on more than one variable. Just sort both datasets on both variables, then list both in the -merge- command: .
What is the difference between Merge and append in Stata?
append adds observations to the existing variables. merge adds variables to the existing observations. That is an oversimplification because merge does not require that the datasets have the same observations.
How does merge work in Stata?
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.
Can you merge multiple datasets in Stata?
In order for Stata to merge the datasets, the id variable, or variables, will have to have the same name across all files. Once you have identified all the variables you need, and know what the id variable(s) are, you can begin to merge the datasets.
Can you merge 3 datasets in Stata?
Commands Syntax There are three commands you should know if you want to combine datasets: append, merge and joinby. All three of them combine the dataset currently in memory with data from a file you specify. We will name the data in memory “Master Data” and the data to combine from the specified file “Using Data”.
How to merge two datasets in Stata?
From that data, we shall create two datasets. One of the dataset will remain in the Stata memory, we shall call it data_memory. The other data set will be saved to a file, we shall call it data_file. The data_file has two variables, name and symbol. We shall merge the data_memory into data_file using variable name as the merging criterion.
What is the difference between data_file and data_memory in Stata?
One of the dataset will remain in the Stata memory, we shall call it data_memory. The other data set will be saved to a file, we shall call it data_file. The data_file has two variables, name and symbol.
How to use smerge program to merge current data in memeory?
We typed smerge and then the variable name. The name variable is the key variable that we are using as the merging criterion. Option use ( data_file) tells smerge program to merge the current data in memeory with the file data_file.
Does Stata recognize observations as 2 unique observations?
Still, Stata recognizes the observations (origin_city=NY, dest_city=WA) and (origin_city=WA, dest_city=NY) as 2 unique observations. I also see no options in the egen concat () function that could help me with this.