st: matching observations across variables

[Yogesh Uppal <stata.list.queries@gmail.com>]

Hi Statalisters,

I have a problem that I am not sure how to solve. I have data of the
following form:

input str2 state city neighboring_city1 neighboring_city2
neighboring_city3 outcome neighbor
"A" 1 3 4 5 1 .
"A" 2 1 4 5 1 .
"A" 3 1 5 6 0 1
"A" 4 1 2 . 0 1
"A" 5 1 2 3 0 1
"A" 6 5 4 . 0 0
end

neighboring_city1, neighboring_city2, and neighboring_city3 identify
all the neighboring cities of cities in the variable "city". outcome
is some variable I am interested in. This is how I have set up the
data so far. I want to create a variable called "neighbor" that is 1
for all cities that have 0 as outcome and are a neighbor to a city
with 1 as outcome. For example, the neighbor variable I created here
is 1 for city 3 because it is neighbor to city 1. However, city 6 is 0
because it is not a neighbor to a city that has 1 as outcome.

I hope I laid out the problem clearly. I would appreciate it if anyone
can suggest a solution.

thanks in advance,

Yogesh
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