On 12-01-22 3:56 PM, R. Michael Weylandt wrote:
CRAN suggests it's not available for windows since the build can't be
automated: http://cran.r-project.org/bin/windows/contrib/r-release/ReadMe
but it suggests builds are available from Prof Ripley (to whom be
honor and praise for ever and ever, amen!) here:
http://www.stats.ox.ac.uk/pub/RWin/bin/windows/contrib/2.14/
That build would normally be found automatically by
install.packages("XML")
and it was when I just tried it. Perhaps David has "CRAN (extras)"
disabled in his list of selected repositories?
Duncan Murdoch
Michael
On Sun, Jan 22, 2012 at 3:52 PM, David Stevens<david.stev...@usu.edu> wrote:
I'm following this thread and got curious about Ryacas. After installing
yacas and Ryacas, I was alerted to the missing XML package for Windows.
I couldn't find in on a couple of mirrors so I tried
http://www.omegahat.org/RSXML/ and
install.packages("XML", repos = "http://www.omegahat.org/R";)
but got
Installing package(s) into 'D:/Users/David Stevens/Documents/R/win-library/2.14'
(as 'lib' is unspecified)
Warning message:
In getDependencies(pkgs, dependencies, available, lib) :
package 'XML' is not available (for R version 2.14.1)
for my troubles. The date on the omegahat site is 17 Jan 2012. Am I missing
something?
David Stevens
On 1/22/2012 12:39 PM, Gabor Grothendieck wrote:
On Sun, Jan 22, 2012 at 1:25 PM, Eliano<eliano.m.marq...@gmail.com> wrote:
People,
I'm researching some Bayesian statistic topics and in the midle of my study
i found a very simple problem and i'm trying to find a simple package to
solve this type of equations:
Lets say that i need to compute beta values for the beta distribution and i
now for example:
E(teta)=a/(a+b) = 0,5
Var(teta)=ab/((a+b)^2(a+b+1))=0.05
So if i want to solve this to non-linear system to find a,b for the beta
distribution wich pack should i use?
The equations giving a and b as a function of m and v are:
library(Ryacas)
a<- Sym("a"); b<- Sym("b")
m<- Sym("m"); v<- Sym("v")
Solve( List(a/(a+b) == m, a*b/((a+b)^2*(a+b+1)) == v), List(a, b) )
expression(list(list(a == m^2 * (1 - m)/v - m, b == a/m - a)))
Based on the above we write this R function:
beta.parms<- function(m, v) {
a<- m^2 * (1-m)/v - m
b<- a/m - a
c(a = a, b = b)
}
and run it:
beta.parms(m = 0.5, v = 0.05)
a b
2 2
--
David K Stevens, P.E., Ph.D., Professor
Civil and Environmental Engineering
Utah Water Research Laboratory
8200 Old Main Hill
Logan, UT 84322-8200
435 797 3229 - voice
435 797 1363 - fax
david.stev...@usu.edu
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