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Aug 22, 2014 10:18 AM
(3315 views)

When using the Distribution Platform to use bootstrapping, what is the default size of the individual bootstrap samples? Is it possible to select the size of the samples?

Steve

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Aug 22, 2014 3:09 PM
(5355 views)
| Posted in reply to message from Steven_Moore 08/22/2014 01:18 PM

I think the question was about the "sample size", not the number of samples.

My understanding of the bootstrap method is that the sample size would be the number of data points that you have. So in Lou's example, the sample size would be 40. That sounds kind of weird when you think you are taking a "sample". How can you take say 100 samples if each sample contains all 40 data points? The answer is that each sample differs because the sampling is being done **with replacement**. Therefore in any one sample, some data points may appear multiple times and others may not appear at all.

Dave

-Dave

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Re: Bootstrapping Question

Aug 22, 2014 1:58 PM
(3175 views)
| Posted in reply to message from Steven_Moore 08/22/2014 01:18 PM

The bootstrapping capability is a JMP Pro capability. The default number of samples is 100 but one can set it to the desired number through the use of the dialog box that appears when it is enabled.

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Aug 22, 2014 3:09 PM
(5356 views)
| Posted in reply to message from Steven_Moore 08/22/2014 01:18 PM

I think the question was about the "sample size", not the number of samples.

My understanding of the bootstrap method is that the sample size would be the number of data points that you have. So in Lou's example, the sample size would be 40. That sounds kind of weird when you think you are taking a "sample". How can you take say 100 samples if each sample contains all 40 data points? The answer is that each sample differs because the sampling is being done **with replacement**. Therefore in any one sample, some data points may appear multiple times and others may not appear at all.

Dave

-Dave

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Re: Bootstrapping Question

Aug 23, 2014 5:11 AM
(3175 views)
| Posted in reply to message from David_Burnham 08/22/2014 06:09 PM

Thank-you Dave.

Steve