[R] random sampling or random replacement

[Girish A.R.]

Joanne,

====================
[...snip...]

x <- sample(10000:20000, 100) #without replacement

Now I want x to contain to 20% missing data (NA). Could anyone help me 
how to do this?
================
See if this helps:
n <- length(x)
x[sample(n, 0.2*n)] <- NA

cheers,
-Girish
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