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Oct 13, 2017 6:50 AM
(5310 views)

I am doing a proportional hazards model and trying to do a bootstrap for the risk ratios. I can't provide my data, but since I keep getting the same error in both my data and a simple JMP example for the sample data library, I am attaching that example here. I run the proportional hazards model, focusing on the risk ratios for two groups (which I set up at random) - a test group and a control group. I click on the risk ratio estimates and attempt a bootstrap analysis - but I keep getting the error that it failed to converge. I understand generally what the bootstrap sample is doing and that nonconvergence is a possibility, but since I get this error every time - and with any data I try it with - I suspect I am doing something wrong. Please let me know if you can see a reason why my bootstrap keeps failing. Thank you.

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Hello, I'm not sure why it's failing to converge. Have you tried using the Fractional Weights option when you do the Bootstrap? That can help in situations where there aren't a lot of observations in particular cells. In this case, that would be cells in the Censor * group 2-by-2 contingency table.

Michael

Michael

Michael Crotty

Sr Statistical Writer

JMP Development

Sr Statistical Writer

JMP Development

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Re: Need help with Bootstrap

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Michael

Michael Crotty

Sr Statistical Writer

JMP Development

Sr Statistical Writer

JMP Development

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Re: Need help with Bootstrap

Glad to hear that it's working for you!

Michael Crotty

Sr Statistical Writer

JMP Development

Sr Statistical Writer

JMP Development