We propose one and a half criteria for determining how many measurements are needed to quantify entanglement reliably. We base these criteria on Bayesian analysis of measurement results, and apply our methods to four-qubit entanglement, but generalizations to more qubits are straightforward.
@article{arxiv.1011.2709,
title = {Criteria for reliable entanglement quantification with finite data},
author = {Jun O. S. Yin and Steven J. van Enk},
journal= {arXiv preprint arXiv:1011.2709},
year = {2015}
}