In my data set, I set one missing cell data: First conditional if will check for missing cell then replace its data with any other chosen cell. If there is any empty cell in Data set, we can replace value of that cell from another cell using _n variable. Replacing any missing data using replace command in Stata: If we have to take average or have to work independently on Car sales data one by one and comparing them with whole results we can use this by group representation of variables in Stata. We can validate our answer by using above command in command window of Stata. You can use the command in Stata: bys Car_No: gen C_No_of_Row = _N As for _n, Let’s take this also as a variable with respect to Car No. _N can also be used as group function of any other variable. Understanding _N variable in group by using bys command in Stata This can be used if we want to work on data of a specific car for specific month in Stata. So, Row number with respect to Car No is also three values for each car. Stata Command: bys Car_No: gen C_Row_Number = _nīy using command above, we have results as: Let’s generate another variable which will tell row number according to Car no. Like if we like to have row number with respect to Car_No. We can also use this variable in group, means we can use this variable by representation of another variable in data set. Related Article: Stata Command Modifiers if, in, by, bysort Qualifiers and Statements in Stata Understanding _n variable in group by using bys command in Stata This variable is helpful especially when we need to take mean in Stata, we can directly use this variable instead of counting the number and then calculating mean. We can also see this by generating a new variable No_of_Rows and then that variable will showing total number of observation in data set.Īs we can see it should be 15 so let’s test it using command gen No_of_Rows =_NĪs can be seen, total number of observation is 15 and result is also showing 15. _N as described previously is total number of observation. Generate command to test _N variable in Stata So, we can perform any task on any specific row using _n variable in Stata.
#VARIABLE DATA CREATOR SERIAL#
It should be equal to the serial number, as that is representing the row number.Īs we can see, it generated a new variable called Row_Number and mentioned one by one row number of each row which we can also see is serial number. It should be equal to the serial number, as that is representing the row number.īy using generate command: gen Row_number = _n
This can be seen if we generate a new variable Row Number and set it equal to _n to check what row number of all the rows in data set. Now we will see the row number of each row. Generate command to test _n variable in StataĪs discussed earlier _n is the row number, or you can say a specific number of row we are going to work on.
This command will open the window of Data set I saved earlier to perform my test on. Please make sure if there is any space in file name path, then write the name in quotation marks. Import the dataset into Stata using following command. To understand this we are using an example of following dataset: Related Article: Local and Global Macros in Stata Using own Dataset for testing in Stata In this article, we are going to learn different ways of using these variables in Stata. And _N represents total number of observations or total number of rows. _n and _N are the system variables of Stata where _n represent number of current observation, or you can say row number (specific row on which we need to perform an action).
You can also open this window by using help icon in Stata Toolbar.
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