Split IDs in categorical variables

Question

I have a variable with IDs:

clear

input ID
1
.
2
1
.
3
4
5
4
4
6
end

How can I create separate categorical variables with ID as a name and values of 1 and 2 (the latter if the generated variable matches the ID)?

For example, variable _ID_1 should look as follows:

2
.
1
2
.
1
1
1
1
1
1

Any ideas?

Answer 1

Another way to do it:

clear

input ID
1
.
2
1
.
3
4
5
4
4
6
end

forvalues j = 1/6 { 
    generate ID_`j' = 1 + (ID == `j') if ID != . 
} 

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