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Any help with bootstrapping
4 messages · Ivone Figueiredo, ~ DLC ~, Uwe Ligges +1 more
hello, The distribution of your t* seems so asymmetric that the correction for the acceleration is big and extreme t* are selected as critical values of your CI. As BCa CI have the propriety of transformation invariance, a transformation of the scale makes no sense. (you could choose transformed bootstrap-t CI). One possibility to avoid your problem with BCa Ci is to increase R, the number of replications. Try 1500 or more... hope this help, dlc
Could someone help me on how to correctly try to correct this error message arning : BCa Intervals used Extreme Quantiles Some BCa intervals may be unstable Warning message: Extreme Order Statistics used as Endpoints in: norm.inter(t, adj.alpha) Regards IF
Ivone Figueiredo wrote:
Could someone help me on how to correctly try to correct this error message arning : BCa Intervals used Extreme Quantiles Some BCa intervals may be unstable Warning message: Extreme Order Statistics used as Endpoints in: norm.inter(t, adj.alpha) Regards IF
Note that this is not an error, but a "just" warning. Can we assume you used boot() from package "boot"? Uwe Ligges
This is not an error. It is a warning. I sometimes get it when there are aren't enough data or there aren't enough bootstrap iterations. -roger
Ivone Figueiredo wrote:
Could someone help me on how to correctly try to correct this error message arning : BCa Intervals used Extreme Quantiles Some BCa intervals may be unstable Warning message: Extreme Order Statistics used as Endpoints in: norm.inter(t, adj.alpha) Regards IF [[alternative HTML version deleted]]
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