Description Usage Arguments Details Value Note References See Also Examples
General a small sample of size M out of a huge population of size N.
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N |
The size of the population. |
M |
The sample size. |
seed |
A |
HSEL.bigz
generates a sample of size M from a population of size N, with space complexity linear in M.
rejsample
is similar to HSEL.bigz
, but implemented using direct rejection through unique
.
sample1
generates one number of 0 to N-1 using simple rejection and urand.bigz
.
For HSEL.bigz
and rejsample
, a bigz
vector of length N
, between 1 and N.
For sample1
, a bigz
integer, between 0 and N-1.
rejsample
can be very slow when M is large.
Jarmo Ernvall and Olli Nevalainen. 1982. An Algorithm for Unbiased Random Sampling. THE COMPUTER JOURNAL, VOL. 25, NO. 1, 45–47
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