How Do I Graph Age at A Specific Value?

[Roman Johnson]

Hi,

I am wanting to graph age (continuous variable) starting at age 40, but it starts at age 30 in the dataset. Other than recoding the variable to drop all cases less than 40, what are some ways you'd recommend I graph this?

[Clyde Schechter]

You can add -if age >= 40- to your -graph- command.

[Roman Johnson]

Thanks, Clyde.

I tried that I got an error message.


qui margins, at(employment= 0 married=1 if age <=40)
variable 'if' not found in list of covariates
r(322);

[Clyde Schechter]

No. That's not valid syntax, and that's also not a graph command. Something like

graph twoway line y age if age >= 40

If the command generating your graph is -marginsplot- then it's more complicated, because -marginsplot- does not allow -if- conditions. So if that's your situation, post back and I'll help you figure it out.

[Roman Johnson]

Yes, I'm trying to use marginsplot to do the above.

[Marcos Almeida]

Below you have examples with restrictions for Yvar and for Xvar:

sysuse auto
su mpg
su price
regress price mpg i.foreign
margins foreign, at(mpg=(30(1)41))
marginsplot
margins foreign if price > 5000
marginsplot

[Roman Johnson]

Thank you. That worked Marcos.

[Roman Johnson]

Does anyone know how to plot several marginal probabilities and place them on the same graph?

[Marcos Almeida]

You may wish to take a look at the user-written combomarginsplot for that matter.