Difference-in-difference coding/syntax

[Sherine Maui]

Hi,

Just a quick question regarding the Stata code. I’m running a difference in difference analysis and I have two models, one where the treatment is if a woman has given birth to a son, and the other is if a woman has had any additional children. I have two dummy variables, one is whether a woman has given birth, the other whether a woman has a son or not. I also have another variable that counts the total number of children a woman has. To generate the variables for the first model I run the following code:

**Time period= 2006 pre 2012 post**
***treatment= has a child and that child is a boy***
 
 
*** Difference in Difference estimations with individuals ***
 
*Generate a dummy variable to indicate when the treatment started:2006*
 
gen time=(round>2006) &!missing(round)
 
*Generate a dummy variable to identify the group exposed to treatment*
 
gen treated =(birthstat==1 & sondum2==0)
* Generate an interaction term between time and treated
 
gen did=time*treated

For the second model where the treatment is if a woman has had any additional children I am not quite sure how to generate my treatment variable (total child + any number of additional children).

Any help with the code is greatly appreciated. Thanks.