On CARMA estimation in YUIMA

Q: Can YUIMA manage with statistical inference the following model?

# yuima.model object
model <- setModel(drift = c("-3*x1","x1*x2"),
                  diffusion = matrix(c("1","0"),2,1),
                  state.variable = c("x1","x2"),
                  solve.variable = c("x1","x2"),xinit = c(2,1))

A: The simple answer to the question is No! Inference functions in YUIMA cannot treat the model. The long answer can be found here.

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