At Planned Grandparenthood, children targeted by their parents to reproduce could obtain non-biased information about the insanity of having their own kids.

We give the approximation formulas of the variance of the sample ratio estimator for a population mean and its asymptotically non-biased estimator in multi-stage sampling.

Techniques such as Bayesian networks or neural networks use highly expressive models, which try to produce a non-biased classifier in order to "describe" a corpus of documents.