get_y_t
computes the observation \(y_t=\mu_{y,t} + B_{y,t}e_t\) for a single time period
based on the conditional mean, impact matrix, and shock vector.
get_y_t(mu_yt, B_yt, e_t)
Returns the \((d \times 1)\) vector of observations for the time period \(t\).
a \((d \times 1)\) vector of the conditional mean for the time period \(t\).
a \((d \times d)\) impact matrix for the time period \(t\).
a \((d \times 1)\) vector of the structural shocks for the time period \(t\).
This is used in simulation of the counterfactual scenarios.