Stata Wald Test: Code Example and Explanation

In Stata, you can conduct a Wald test using the test command. Here's an example code:

// Import data
use 'data.dta', clear

// Run linear regression model
reg y x1 x2 x3

// Perform Wald test
test x1 = x2 = x3

This code assumes you have a dataset named 'data.dta' containing variables y, x1, x2, and x3. The reg command runs a linear regression model with y as the dependent variable and x1, x2, and x3 as independent variables. Finally, the test command performs the Wald test to check if the coefficients of x1, x2, and x3 are simultaneously equal to zero.