st: Marking Levels of Categorical Variable

[jasonm@ucla.edu]

I have a categorical variable with 30 levels. How do I create a  
variable that is equal to 1 if a category of the variable shows up  
more than 10% of the time.

For example:
var  Percent
A      5
B      5
C      10
D      20
E      60
How would I create "newvar" equal to 1 for C, D, and E and equal to 0  
for A and B?

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