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delta_t
2011 Nov 12
1
State space model
...e 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_13 <- 2*K_1*theta_1/sig...