glueformula: simply build regression formulas from vectors with variable names

The small new package glueformula with a single function gf facilitates constructing regression formulas from vectors with variable names. The syntax is similar to glue strings. Here is an example:

# Example: build a formula# for ivreg with gflibrary(glueformula)# Contol variables and instrumentscontr=c("x1","x2","x3","log(x4)")instr=c("z1","z2",contr)# Create formula for ivreggf(q~p+{contr}|{instr})

## q ~ p + x1 + x2 + x3 + log(x4) | z1 + z2 + x1 + x2 + x3 + log(x4)

There is no big benefit if one wants to estimate a single regression, but in econometrics one often specifies a lot of similar regressions (for robustness checks not p-hacking!) that share a large set of common control variables. Here glueformula can be handy.

You can install it from Github as explained here: https://github.com/skranz/glueformula

There was also a discussion here whether a similar feature should be included into the glue package itself, but it looks as if that is not going to happen.