explain stata while with break with specific example
时间: 2024-03-07 19:47:14 浏览: 19
In Stata, the `while` loop is used to repeat a command or set of commands while a certain condition is true. The `break` statement is used to exit the loop if a certain condition is met.
Here is an example:
Suppose we have a dataset with a variable `x` that starts at 1 and increases by 1 each time. We want to create a loop that will stop once `x` reaches 10. Within the loop, we want to print the value of `x` and then add 2 to it.
Here is the code:
```
clear
set obs 1
gen x = 1
while x <= 10 {
di x
if x == 5 {
break
}
gen x = x + 2
}
```
In this code, we first clear the dataset and create a variable `x` that starts at 1. We then begin the `while` loop. The loop will continue as long as `x` is less than or equal to 10. Within the loop, we first print the value of `x` using the `di` command. We then check if `x` is equal to 5. If it is, we use the `break` statement to exit the loop. If `x` is not equal to 5, we add 2 to it using the `gen` command.
When we run this code, Stata will print the values of `x` from 1 to 5, and then exit the loop when `x` is equal to 5. The final value of `x` in the dataset will be 5.