Generating risk-free Return

[Sartaj Hussain]

I try using the below code of subtracting monthly risk free rate (rf) from each of the 25 monthly portfolio returns (idio1-idio25). It show a bug:

invalid syntax
r(198);

But I can't figure out where am i making error in writing the code.

local vars idio1-idio25
foreach local var of local vars {
    generate ex_`var'=`var'-rf
}

[Øyvind Snilsberg]

local vars idio1 idio2 idio3 idio4 idio5 idio6 idio7 idio8 idio9 idio10 idio11 idio12 idio13 idio14 idio15 idio16 idio17 idio18 idio19 idio20 idio21 idio22 idio23 idio24 idio25
foreach var in `vars' {
gen ex_`var' = `var' - rf
}

ds idio*
foreach var in `r(varlist)' {
gen ex_`var' = `var' - rf
}

foreach var of varlist idio* {
gen ex_`var' = `var' - rf
}

[Sartaj Hussain]

Thanks! Øyvind Snilsberg