search for: zamar

...= mel.fun, R = 999, F.surv = mel.surv, G.surv = mel.cens, sim = "cond", cox = mel.cox, index = c(1, 8)) Bootstrap Statistics : original bias std. error t1* 0.09967665 0.03579701 0.04973614 I want to apply the Fast bootstrap method from Salibian-Barrera and Zamar (2003) and Salibian-Barrera, M., Van Aels, S. and Willems, G. (2007) to the previous example, i.e., to produce a confidence interval for the exponent of the coefficient of tumour thickness in the Melanoma dataset . Moreover, I want to compare the performance of the Fast bootstrap with that of th...

...el.fun, R = 999, F.surv = mel.surv, G.surv = mel.cens, sim = "cond", cox = mel.cox, index = c(1, 8)) Bootstrap Statistics : original bias std. error t1* 0.09967665 0.03579701 0.04973614 I want to apply the Fast bootstrap method from Salibian-Barrera and Zamar (2003) and Salibian-Barrera, M., Van Aels, S. and Willems, G. (2007) to the previous example, i.e., to produce a confidence interval for the exponent of the coefficient of tumour thickness in the Melanoma dataset . Moreover, I want to compare the performance of the Fast bootstrap with that of th...

...el.fun, R = 999, F.surv = mel.surv, G.surv = mel.cens, sim = "cond", cox = mel.cox, index = c(1, 8)) Bootstrap Statistics : original bias std. error t1* 0.09967665 0.03579701 0.04973614 I want to apply the Fast bootstrap method from Salibian-Barrera and Zamar (2003) and Salibian-Barrera, M., Van Aels, S. and Willems, G. (2007) to the previous example, i.e., to produce a confidence interval for the exponent of the coefficient of tumour thickness in the Melanoma dataset . Moreover, I want to compare the performance of the Fast bootstrap with that of th...

...el.fun, R = 999, F.surv = mel.surv, G.surv = mel.cens, sim = "cond", cox = mel.cox, index = c(1, 8)) Bootstrap Statistics : original bias std. error t1* 0.09967665 0.03579701 0.04973614 I want to apply the Fast bootstrap method from Salibian-Barrera and Zamar (2003) and Salibian-Barrera, M., Van Aels, S. and Willems, G. (2007) to the previous example, i.e., to produce a confidence interval for the exponent of the coefficient of tumour thickness in the Melanoma dataset . Moreover, I want to compare the performance of the Fast bootstrap with that of th...

Hello to R people Does anybody know to calculate exact logistic regression in R? Does such option exist anywhere? Surprisingly, could not find it using search engine. It is hard to believe, however, that such useful function is not implemented in R yet? Could you help, please Thank you Denis

In the robust library of S+, it is possible to compute Rocke's constrained M-estimator of scatter and location. Can't find anything within R that does the same thing. Can someone tell me whether any package exists for computing it? Thanks. Rand Wilcox Professor Dept of Psychology University of Southern California Los Angeles, CA 90089-1061 FAX: 213-746-9082

..._ Tomas Aragon, MD, DrPH -----old post 2002 end------------ At that time, the answers were not too encouraging. Anyway, I might have the very same query 2008. Ok, I tried to do some homework and started to look for packages maybe implementing different methods. I did run across 'elrm' (Zamar, D., McNeney, B. & Graham, J., 2007), but I am unsure whether this package is appropriate for my original 1:3 matched design. - ---Blah blah part end-------- - ---Questions, finally!--- So my questions to you are: 1) Is the problem I describe above likely related to small sample sizes? 2) D...