types - How can I change the value stored in local macro from string to numeric in Stata? -


i want generate variable lagged year depending on year stored in "$s_date" macro

i have stored year in date macro:

. local date substr("$s_date",8,.) . display `date'   2015

and want generate new variable with

gen start_year =`date'- y_passed

where y_passed variable containing integers 1 10, , get:

. gen start_year = `date' - y_passed type mismatch r(109);

i know happen because macro stored string.

how can change value stored in local macro string numeric?

if add =, stata evaluate expression defines local date:

clear set more off  set obs 10 gen y_passed = _n  local date = substr("$s_date",8,.) display `date'  gen start_year = `date' - y_passed  list

otherwise, local holds string, not number in string type! see

. local date substr("$s_date",8,.)  . display `"`date'"' substr("14 may 2015",8,.)

the confusion because display evaluate you. in reality, 

display `date'

expands to

display substr("14 may 2015",8,.)

and latter results in 

2015

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