stata - How do I create a "macro" for regressors in R?

Question

For long and repeating models I want to create a "macro" (so called in Stata and there accomplished with global var1 var2 ...) which contains the regressors of the model formula.

For example from

library(car)
lm(income ~ education + prestige, data = Duncan)

I want something like:

regressors <- c("education", "prestige")
lm(income ~ @regressors, data = Duncan)  

I could find is this approach. But my application on the regressors won't work:

reg = lm(income ~ bquote(y ~ .(regressors)), data = Duncan)

as it throws me:

Error in model.frame.default(formula = y ~ bquote(.y ~ (regressors)), data =
Duncan,  :  invalid type (language) for variable 'bquote(.y ~ (regressors))'

Even the accepted answer of same question:

lm(formula(paste('var ~ ', regressors)), data = Duncan)

strikes and shows me:

Error in model.frame.default(formula = formula(paste("var ~ ", regressors)),
: object is not a matrix`. 

And of course I tried as.matrix(regressors) :)

So, what else can I do?

Answer 1

For the scenario you described, where regressors is in the global environment, you could use:

lm(as.formula(paste("income~", paste(regressors, collapse="+"))), data = 
Duncan)

Alternatively, you could use a function:

modincome <- function(regressors){
    lm(as.formula(paste("income~", paste(regressors, collapse="+"))), data = 
Duncan)  
}

modincome(c("education", "prestige"))