Keep if and drop if commands can be used to keep and drop observations.
The above showed how to use keep and drop variables to eliminate variables from your data file. If we wanted to make this change permanent, we could save the file asįile auto2.dta saved Keeping and dropping observations Note: dataset has changed since last save Size: 3,034 (99.7% of memory free) (_dta has notes) drop displ gear_ratioĪgain, using describe shows that the variables have been eliminated. We can get rid of them using theĭrop command shown below. Perhaps we are not interested in the variables displ and gear_ratio. First, let’s clear out the data in memory and Let’s show how to use the drop command to drop variables. Save command after you have eliminated variables, and it is recommended that you save such files to a file with a new name, e.g., It is important to be careful when using the In effect, we would permanently lose all of the other variables in the data file. If we saved this file calling itĪuto, it would mean that we would replace the existing file (with all the variables) with this file which just has Remember, this has not changed the file on disk, but only the copy we have in memory. Note: dataset has changed since last saved Size: 1,924 (99.8% of memory free) (_dta has notes) If we issue the describe command again, we see that indeed those are the only variables left. Keep just those variables, as shown below. Suppose we want to just have make mpg and price, we can Variable name type format label variable labelĭisplacement int %8.0g Displacement (cu. Size: 3,478 (99.7% of memory free) (_dta has notes) describeĬontains data from C:Program FilesStata10adobase/a/auto.dta We can use the describe command to see its variables.
If we think of your data like a spreadsheet, this section will show how you can remove columns (variables) from your data. Keep and drop commands to subset variables. Sometimes you do not want all of the variables in a data file. Use a data file if you are trying to read a file that is too big to fit into the memory on your computer.
You can subset data by keeping or dropping variables, and you can subset data by keeping or dropping observations. Its icon will also be added to your device home screen.This module shows how you can subset data in Stata.
After Autodata Voorraad is downloaded, you'll see an INSTALL button to the right.If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.Tap on the GET button to the right of the app to start downloading it.
Autodata Voorraad is a free app for iOS published in the Office Suites & Tools list of apps, part of Business.