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Draws samples uniformly (for internal use only)
samplefun(x, index, n0)
The VD values
the index for VD value, it can be 1, 2, 3,....
Sample size
selected ids
selected VD levels
Uniform sampling (internal use only)
sampletot
# NOT RUN { x=rnorm(100) index=1:100 samplefun(x, index, 40) # }
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