bootstrap

astropy.stats.bootstrap(data, bootnum=100, samples=None, bootfunc=None)

Performs bootstrap resampling on numpy arrays.

Bootstrap resampling is used to understand confidence intervals of sample estimates. This function returns versions of the dataset resampled with replacement (“case bootstrapping”). These can all be run through a function or statistic to produce a distribution of values which can then be used to find the confidence intervals.

Parameters:

data : numpy.ndarray

N-D array. The boostrap resampling will be performed on the first index, so the first index should access the relevant information to be bootstrapped.

bootnum : int

Number of bootstrap resamples

samples : int

Number of samples in each resample. The default None sets samples to the number of datapoints

bootfunc : function

Function to reduce the resampled data. Each bootstrap resample will be put through this function and the results returned. If None, the bootstrapped data will be returned

Returns:

boot : numpy.ndarray

Bootstrapped data. Each row is a bootstrap resample of the data.