Home / Store / Journals / Electronic Articles / Nuclear Science and Engineering / Volume 129 / Number 2 / Pages 199-202
Thomas E. Booth
Nuclear Science and Engineering / Volume 129 / Number 2 / Pages 199-202
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Zero-variance biasing procedures are normally associated with estimating a single mean or "tally." In particular, a zero-variance solution occurs when every sampling is made proportional to the product of the true probability multiplied by the expected score (importance) subsequent to the sampling; i.e., the zero-variance sampling is importance weighted. Because every tally has a different importance function, a zero-variance biasing for one tally cannot be a zero-variance biasing for another tally (unless the tallies are perfectly correlated). The way to optimize the situation when the required tallies have positive correlation is shown.
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