Hi,
I would like to make a loop were I create 20 new variables (stretching 2001-2020) using two constrictions with if. Bellow I make an example of how I would do it manually variable by variable. How can I do this more efficient?

gen newvariable1 = 0
replace new variable1 = 1 if variable==1 & year2001
gen newvariable2 = 0
replace new variable2 = 1 if variable==1 & year2002

gen newvariable3 = 0
replace new variable3 = 1 if variable==1 & year2003

gen newvariable4 = 0
replace new variable4 = 1 if variable==1 & year2004

gen newvariable5 = 0
replace new variable5 = 1 if variable==1 & year2005


/David