loop

[Jade Li]

Hi Everyone,

I would like to use a loop for the following code:

gen var1=1 if x == y1 | x == y2 | x == y3| x == y4| x == y5| x == y6| x == y7| x == y8 | x == y9 | x == y10 | x == y11 | x == y12 | x == y13

I used this code:

gen var2=1 if x == y`j' | x == y[`j'+1]

But it did not give me the same results as before. How should I adjust the code?

[Hemanshu Kumar]

You don't really need a loop.

If these are numeric variables, you can simply use

gen byte var1 = inlist(x,y1,y2,y3,y4,y5,y6,y7,y8,y9,y10,y11,y12,y13)

If these are string variables, you are limited to nine comparisons, so you will need to break it up into two:

gen byte var1 = inlist(x,y1,y2,y3,y4,y5,y6,y7,y8,y9) | inlist(x,y10,y11,y12,y13)

If you must use a loop (perhaps because this is one part of several other things you accomplish in the loop), you can do

gen byte var1 = 0

forval j = 1/13 {
    replace var1 = 1 if x == y`j'
}

[Jade Li]

Thank you Hemanshu, it worked very well.