st: creating variable with randomly missing values

["Ahmed Arif" <arifaa@gmail.com>]

I have a dataset with variables x and y. the dataset has 5000
observation. i want to generate another variable xmiss, such that 50%
of x values are dropped (recoded as missing value) randomly from the
dataset w/o affecting values of y. is there an easy way to do this?
thanks

-- 
Ahmed Arif
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