Models

EViews 6 model solution may be up to 30 times faster than under EViews 5.1. Among the improvements:

• A new solution algorithm has been added to models. Broyden's method is a quasi-Newton method that uses a secant approximation to the Jacobian instead of the true Jacobian when solving for the Newton step. The method has many of the desirable properties of Newton's method without requiring the Jacobian to be evaluated and factored at each step.

Broyden's algorithm is available for model solve.

• The model solver can now reorder equations within simultaneous blocks so that a set of variables in the block can be solved for recursively, conditional on the values of the remaining variables in the block. This structure is used by the Newton and Broyden solution algorithms to substantially reduce the time required to solve models consisting of large sparse systems of equations.

• Stochastic simulations can now be based on bootstrapped residuals as an alternative to normally distributed random numbers. Bootstrapped residuals may be drawn independently for each equation, or may be drawn from the same period across all equations.

• The complete set of results from each repetition of a stochastic simulation can now be saved as a new page in the workfile.

• Equations for endogenous variables can now be excluded from the model (treated as exogenous variables) automatically based on whether actual values are available for the variable in each period. This makes it easy to perform forecasts using all available data when new data arrive at different dates.
 

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EViews 6 for Windows

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