Displaying 6 results from an estimated 6 matches for "lambda_2".
Did you mean:
lambda2
2011 Sep 22
1
Error in as.vector(data) optim() / fkf()
...d" being a matrix. Any help on explaining what's
going on and how to solve this is much appreciated.
Thank you,
Kristian
library(FKF) #loading Fast Kalman Filter package
library(Matrix) # matrix exponential package
K_1 = 0.1156
K_2 = 0.17
sigma_1 = 0.1896
sigma_2 = 0.2156
lambda_1 = 0
lambda_2 = -0.5316
theta_1 = 0.1513
theta_2 = 0.2055
#test data
tyield <- matrix(data = rnorm(200), nrow =2, ncol =100)
# defining dimensions
m <- 2 # m is the number of state variables
n <- 100 # is the length of the observed sample
d <- 2 # is the number of observed variables.
theta <- c(...
2011 Nov 12
1
State space model
...ncol=40)
m <- 2 # m is the number of state variables
n <- ncol(x) # is the length of the observed sample
d <- nrow(x) # is the number of observed variables.
h <- 1/52
## creating state space representation of 2-factor CIR model
CIR2ss <- function(K_1, K_2, sigma_1, sigma_2, lambda_1, lambda_2, theta_1,
theta_2, delta_0, delta_1, delta_2) {
## defining auxilary parameters,
phi_11 <- sqrt((K_1+lambda_1)^2+2*sigma_1^2*delta_1)
phi_21 <- sqrt((K_2+lambda_2)^2+2*sigma_2^2*delta_2)
phi_12 <- K_1+lambda_1+phi_11
phi_22 <- K_2+lambda_2+phi_21
phi...
2011 Dec 30
2
Joint modelling of survival data
Assume that we collect below data : -
subjects = 20 males + 20 females, every single individual is independence,
and difference
events = 1, 2, 3... n
covariates = 4 blood types A, B, AB, O
http://r.789695.n4.nabble.com/file/n4245397/CodeCogsEqn.jpeg
?m = hazards rates for male
?n = hazards rates for female
Wm = Wn x ?, frailty for males, where ? is the edge ratio of male compare to
female
Wn =
2009 May 16
1
maxLik pakage
...32,4,9,9,8,36,44,0,9,27,28,55,72,12,1,
9,0,32,0,0,2,15,5,6,17,
63,61,9,15,15,0,2)
#########goal is found unique maximum for 5-parameter function with using "maxLik" function
#####the function in latex commands is as following:
\begin{eqnarray*}
&&\ell(\xi,\omega,\nu,\lambda_1,\lambda_2)=n\log2-n\log\omega+n\log\Gamma(\frac{\nu+1}{2})-\frac{n}{2}\log(\nu\pi)\\
&-&n\log\Gamma(\frac{\nu}{2})-\frac{\nu+1}{2}\sum_{i=1}^{n}\log(1+\frac{(x_i-\xi)^2}{\omega^2\nu})+\sum_{i=1}^{n}\log\Phi(\lambda_1\frac{(x_i-\xi)}{\sqrt{\omega^2+\lambda_2(x_i-\xi)^2}})
\end{eqnarray*}
#############...
2003 Sep 04
1
title expressions
The officially sanctioned way to put the expression "lambda_1 = x" in a title
is something like this:
title(substitute(lambda[1] == lamb, list(lamb = x)))
but suppose I have two lambdas and would like something like
"lambda_1 = x_1 , lambda_2 = x_2"
to appear. What then? Undoubtedly I'm missing something blindingly
obvious with lists, but having tried several versions unsuccessfully
I thought I would defer to the collective expertise of R-help. Thanks
in advance.
url: www.econ.uiuc.edu/~roger/my.html Roger Koenker
email r...
2005 Dec 09
1
O-ring statistic
...ed in one of the packages in R?
This kind of functionality is available in the R package `spatstat'
(available on CRAN or from www.spatstat.org)
According to the cited website, the O-ring statistic is a rescaled
version of the pair correlation function between two types of points:
O_12(r) = lambda_2 g_12(r)
In spatstat, pair correlation functions are computed by the function
'pcf'. To estimate the cross-type pair correlation function,
you do something like
pcf(Kcross(X, 1, 2))
where X is a marked point pattern containing points of types 1 and 2.
To estimate the intensity of ty...