Generating new variables in Stata is mainly achieved by use of the gen command. The simplest way to use the is by appending the newvar option, by specifiying the name and value of the new variable.
gen my_var = 0
tab my_var
Here we just generated a new variable called my_var in the nlsw88 dataset, which has the value of 0 for every observation in the data. Not very useful though.
Instead a variable can be generated that stores some calculation on the data. Using the auto dataset for example we can generate a variable that calculates price per inch:
sysuse auto, clear
gen price_per_inch = price/length
suBy summarizing the dataset we can see that some cars have a lower price per inch than others:
