Displaying 6 results from an estimated 6 matches for "alpha_s".
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alpha's
2007 Jul 23
1
code optimization tips
Hi,
Being new to R I'm asking for some advice on how to optimize the
performance of the following piece of code:
> alpha_c <- function(lambda=600e-9,alpha_s=1e-14,N=400,spacing=1e-7){
>
> k<-2*pi/lambda
> ri<-c(0,0) # particle at the origin
> x<-c(-N:N)
> positions <- function(N) {
> reps <- 2*N+1
> matrix(c(rep(-N:N, each = reps), rep(-N:N, times = reps)),
> nrow = 2, byrow = TRUE)
> }
> rj&...
2005 Apr 27
0
Fitting a kind of Proportional Odds Modell using nlme, polr, lrm or ordgee
Hello,
I'm trying to fit a special kind of proportional odds model from:
Whitehead et al. (2001). Meta-analysis of ordinal outcome using
individual patient data. Statistics in medicine 20: 2243-2260. (model 2)
The data are as follows:
library(nlme)
library(geepack)
library(Design)
library(MASS)
options(contrasts=c("contr.SAS","contr.poly"))
counts <-
2010 Oct 13
5
Poisson Regression
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]]
2018 Nov 01
4
Fwd: RFC: Adding debug information to LLVM to support Fortran
*From:* flang-dev <flang-dev-bounces at lists.flang-compiler.org> *On Behalf
Of *Eric Schweitz (PGI)
*Sent:* Thursday, November 01, 2018 1:02 PM
*To:* flang-dev at lists.flang-compiler.org
*Subject:* [Flang-dev] RFC: Adding debug information to LLVM to support
Fortran
In order to support debugging in the Flang project, work has been done to
extend LLVM debug information for the Fortran
2018 Nov 01
2
RFC: Adding debug information to LLVM to support Fortran
Regarding flags, I was just thinking that maybe we should invent a new DISubprogramFlags type. DISubprogram already has a few bitfields for subprogram-specific things, Fortran will want 3 more, and there's no reason to fill up the generic DIFlags with more bits that are used in only one class.
I agree that the array stuff needs to be designed with an eye to handling how other languages do
2010 Oct 15
0
nomianl response model
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