statistic For Each Bootstrap Sample
The list itself is unmodifiable. The underlying statistic objects can be modified, but have no effect on the bootstrap generate statistics. The statistical values will be changed the next time generateSamples() is executed. Users are advised to copy the statistics in the list (via Statistic newInstance()) before executing generateSamples if persistence is required.
If the save bootstrap data option was not turned on during the sampling then the list returned is empty.
Return
a list of size numBootstrapSamples holding statistics from every bootstrap generated