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    To calculate Efron's 2-tailed Simple Percentile 95% limits:
  1. Randomly select (with replacement) a bootstrap-sample of n observations from your sample of n observations and, using the same formula as your sample statistic, calculate a bootstrap statistic *.
  2. Repeat that to obtain (B=) 1000 to 5000 bootstrap statistics.
  3. Sort your bootstrap statistics into rank order.
  4. Estimate the confidence limits as the 2.5% and 97.5% quantiles of your bootstrap statistics.