Posts Tagged ‘ Bootstrap Confidence Intervals ’

Bootstrap Confidence Intervals for Diversity Indices

April 30, 2011
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Bootstrap Confidence Intervals for Diversity Indices

Here's the bootstrap refinement of the normal asymptotic interval (Mills and Zandvakili, 1997; Dixon et al., 1987; Efron and Tibshirani, 1997) - where Diversity (div, g) is the Simpson Index calculated from the observed sample, k is the number boot...

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Bootsrap Confidence Intervals, Stratified Bootstrap

April 20, 2011
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Bootsrap Confidence Intervals, Stratified Bootstrap

 Here's a worked example for comparing group averages with bootstrap confidence intervals and allowing for different subsample sizes by calling the strata argument within the bootstrap function.The data is set up analogous to an before-after impac...

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