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...interval into 8 equal parts by defining k=9 points (0 included) -lambdas in the following code- and observe the value of the objective function and the constraint on these points and approximate it by the following program: (Sorry for the Latex type equations) max Sum_{j=1}^{2}Sum_{k=0}^{8}f_{kj}lambda_{kj} subject to: Sum_{j=1}^{2}Sum_{k=0}^{8}g_{kj}lambda_{kj}+x2 = 6 Sum_{k=0}^{8}lambda_{k1} = 1 Sum_{k=0}^{8}lambda_{k2} = 1 lambda_{k1} >= 0 lambda_{k2} >= 0 x2 >= 0 library(lpSolve) # Objective function and constraint f1 <- function(x) 2*x-x^2 f2 <- function(y) y g1 <- func...

Hello everyone, I wanted to ask if there is an R-package to fit the following Poisson regression model log(\lambda_{ijk}) = \phi_{i} + \alpha_{j} + \beta_{k} i=1,\cdots,N (subjects) j=0,1 (two levels) k=0,1 (two levels) treating the \phi_{i} as nuinsance parameters. Thank you very much -- -Tony [[alternative HTML version deleted]]

Does anyone have any ideas how I could do a power calculation for a log rank test. I would like to know what the suggested sample sizes would be to pick a difference when the control to active are in a ratio of 80% to 20%. Thanks Dan -- ************************************************************** Daniel Brewer, Ph.D. Institute of Cancer Research Email: daniel.brewer at icr.ac.uk

...ate a density. That isn't because we wouldn't like density estimates. Terry T. On 11/04/2013 04:47 PM, Y wrote: > Hi Dr. Therneau, > > Thanks very much for your kind help! Does survfit() just give me the survival curve? What > I wanted is the baseline hazard estimates, i.e., lambda_{0} (t). How can I obtain this > estimate from coxph()? Or using basehaz()? > > Thanks, > YH > > > > > > > > > > > On Mon, Nov 4, 2013 at 5:29 PM, Terry Therneau <therneau at mayo.edu > <mailto:therneau at mayo.edu>> wrote: > > > &...

Is there a way to estimate a nominal response model? To be more specific let's say I want to calibrate: \pi_{v}(\theta_j)=\frac{e^{\xi_{v}+\lambda_{v}\theta_j}}{\sum_{h=1}^m e^{\xi_{h}+\lambda_{h}\theta_j}} Where $\theta_j$ is a the dependent variable and I need to estimate $\xi_{h}$ and $\lambda_{h}$ for $h \in {1...,m}$. Thank you, Mauricio Romero Quantil S.A.S. Cel: 3112231150 www.quantil.com.co "It is from the earth that we mus...