TSPRED Call
provides predicted values of univariate and multivariate
ARMA processes when the ARMA coefficients are input
- CALL TSPRED( forecast, impulse, mse, data, coef, nar, nma
- <,ev, npred, start,
constant>);
The inputs to the TSPRED subroutine are as follows:
- data
- specifies a data matrix if the intercept is
not included, where denotes the length of the time
series and is the number of variables to be analyzed.
If the univariate time series is analyzed,
the input data should be a column vector.
- coef
- refers to the ARMA coefficient matrix,
where is an AR order and is an MA order.
If the intercept term is included (constant=1), the first
row of the coefficient matrix is considered as the intercept
term and the coefficient matrix is an matrix.
If there are missing values in the coef
matrix, these are converted to zero.
- nar
- specifies the order of the AR process.
If the subset AR process is requested,
nar should be a row or column vector.
The default is nar=0.
- nma
- specifies the order of the MA process.
If the subset MA process is requested,
nma should be a vector.
The default is nma=0.
- ev
- specifies the error variance matrix.
If the ev matrix is not provided, the
prediction error covariance will not be computed.
- npred
- specifies the maximum length of multistep forecasting.
The default is npred=0.
- start
- specifies the position where the multistep forecast starts.
The default is start=.
- constant
- specifies the intercept option.
No intercept estimate is included if constant=0;
otherwise, the intercept estimate is included
in the first row of the coefficient matrix.
If constant=-1, the coefficient matrix
is estimated by using mean deleted series.
By default, constant=0.
The TSPRED subroutine returns the following values:
- forecast
- refers to predicted values.
- impulse
- refers to the impulse response function.
- mse
- refers to the mean square error of -step-ahead forecast.
A scalar missing value is returned if the
error variance (ev) is not provided.
Copyright © 2009 by SAS Institute Inc., Cary, NC, USA. All rights reserved.