Stratification

[Max Rakotonirinalalao]

Hello,

I am trying to create a Table in which you will see positive results (Serum=2) by age group ( agegroup = 1 and then 2, 3, etc...).
This is the first line of my code:

gen agegrouppositive= 1 if agegroup=1 & Serum=2

The syntax is invalid!
Can someone explain why? Can you help me? Thanks in advance


agegroup | Freq. Percent Cum.
------------+-----------------------------------
1 | a f k
2 | b g
3 | c h l
4 | d i m
5 | e j 100.00
------------+-----------------------------------
Total | x 100.00



Serum | Freq. Percent Cum.
------------+-----------------------------------
1 | a c e
2 | b d f
------------+-----------------------------------
Total | g 100.00

[Salvatore Viola]

Dear Max,

You must use two equal signs instead of one when using logic in Stata. Your code should instead look like this:

gen agegrouppositive = 1 if agegroup == 1 & Serum == 2

I believe this is why your code is returning an error.

Best,
Salvatore

[Max Rakotonirinalalao]

Dear Salvatore Viola,

you are a genius. It works.

Thank you very much!