2. What are Difference Between "gen" and "egen"

The "gen" and "egen" commands in Stata have different functionalities:
1. `gen` command:
The "gen" command is short for "generate" and is used to create new variables in Stata. It allows you to create variables based on mathematical operations, logical conditions, or values from existing variables. For example, you can use the "gen" command to create a variable that represents the sum of two other variables or a variable that categorizes observations based on certain conditions.
2. `egen` command:
The "egen" command is short for "extended generate" and provides additional functions for generating variables in Stata. It offers a wide range of built-in functions that allow you to create variables based on more complex calculations or summary statistics. The "egen" command is particularly useful for generating variables that involve group-level operations, such as calculating group means, sums, or proportions.
In summary, while both "gen" and "egen" commands are used to create variables in Stata, "gen" is more suitable for simple calculations and individual-level operations, while "egen" provides more advanced functions for group-level computations and summary statistics.