how to create a squared variable in Stata?

[Shirzaad Madgan]

Hello folks,
I have a age variable and I want to create its square. I would be very grateful if someone could explain me how can I do that. Thank you so much

[Olivier Hoya]

It should just be:

gen age2=age^2

where age2 is the name of the new (squared) variable, and age is the original variable.

[Nick Cox]

As a warm-up

display 2^2

For the main exercise

 
gen agesq = age^2

See

help operators

[Shirzaad Madgan]

Thank you all so much. Worked for me

[Richard Williams]

However, you may not want to. If age squared is going to be an independent variable in your model, you can do things like

reg y age c.age#c.age

See -help fvvarlist-.

[Carlo Lazzaro]

Shirzaad:
from a different corner, you might want to exploit the wonderful -fvvarlist- capabilities:

g sq_age=c.age#c.age

PS: crossed in the cyberspace with Richard's reply.

[Carlo Lazzaro]

Shirzaad:
As per Richard's example, -fvvarlist- can also support you in creating a squared term as a predictor for regression model.