What is "resampling"

n. (context statistics English) Any technique or instance of generating a new sample from an existing dataset. vb. (present participle of resample English)

Resampling may refer to:

• Resampling (audio), several related audio processes
• Resampling (statistics), resampling methods in statistics
• Resampling (bitmap), scaling of bitmap images

In statistics, resampling is any of a variety of methods for doing one of the following:

1. Estimating the precision of sample statistics ( medians, variances, percentiles) by using subsets of available data ( jackknifing) or drawing randomly with replacement from a set of data points ( bootstrapping)
2. Exchanging labels on data points when performing significance tests (permutation tests, also called exact tests, randomization tests, or re-randomization tests)
3. Validating models by using random subsets (bootstrapping, cross validation)

Common resampling techniques include bootstrapping, jackknifing and permutation tests.