Phi(vars)
Phi()所属R语言包:vars
Coefficient matrices of the MA represention
MA“重要的系数矩阵
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Returns the estimated coefficient matrices of the moving average representation of a stable VAR(p), of an SVAR as an array or a converted VECM to VAR.
返回移动平均线表示稳定的VAR(P)的估计系数矩阵,的SVAR作为一个数组或转换VECM VAR。
用法----------Usage----------
## S3 method for class 'varest'
Phi(x, nstep=10, ...)
## S3 method for class 'svarest'
Phi(x, nstep=10, ...)
## S3 method for class 'svecest'
Phi(x, nstep=10, ...)
## S3 method for class 'vec2var'
Phi(x, nstep=10, ...)
参数----------Arguments----------
参数:x
An object of class "varest", generated by VAR(), or an object of class "svarest", generated by SVAR(), or an object of class "svecest", generated by SVEC(), or an object of class "vec2var", generated by vec2var().
varest,或一个类的对象所产生的对象,所产生的VAR(),或对象类的svarest类SVAR(), “”svecest,所产生的SVEC()或对象类的vec2var,所产生的vec2var()。
参数:nstep
An integer specifying the number of moving error coefficient matrices to be calculated.
一个整数,指定移动的误差系数矩阵的数量来计算的。
参数:...
Currently not used.
目前没有使用。
Details
详细信息----------Details----------
If the process \bold{y}_t is stationary (i.e. I(0), it has a Wold moving average representation in the form of:
如果\bold{y}_t是固定的(即I(0),它有一个世界移动平均线表示的形式:
whith Φ_0 = I_k and the matrices Φ_s can be computed recursively according to:
蒙山Φ_0 = I_k和矩阵Φ_s的可以递归计算依据:
whereby A_j are set to zero for j > p. The matrix elements represent the impulse responses of the components of \bold{y}_t with respect to the shocks \bold{u}_t. More precisely, the (i, j)th element of the matrix Φ_s mirrors the expected response of y_{i, t+s} to a unit change of the variable y_{jt}. <br> In case of a SVAR, the impulse response matrices are given by:
据此A_j零j > p。矩阵元素表示的组件\bold{y}_t的脉冲响应相对于冲击\bold{u}_t。更精确地,(i, j)个元素的矩阵Φ_s镜像的预期响应y_{i, t+s}的单位变化的变量y_{jt}。 <br>在一个SVAR的情况下,脉冲响应矩阵为:
Albeit the fact, that the Wold decomposition does not exist for nonstationary processes, it is however still possible to compute the Φ_i matrices likewise with integrated variables or for the level version of a VECM. However, a convergence to zero of Φ_i as i tends to infinity is not ensured; hence some shocks may have a permanent effect.
Wold分解的事实,虽然不存在的非平稳过程,但仍然有可能Φ_i同样的综合变量或VECM级版本的矩阵计算。然而,一个收敛到零的Φ_i趋于无穷大,因为我不能保证,因此一些冲击可能有一个永久的效果。
值----------Value----------
An array with dimension (K \times K \times nstep + 1) holding the estimated coefficients of the moving average representation.
维阵列,(K \times K \times nstep + 1)移动平均线表示的估计系数。
注意----------Note----------
The first returned array element is the starting value, i.e., Φ_0.
第一个返回的数组元素的初始值,即,Φ_0。
(作者)----------Author(s)----------
Bernhard Pfaff
参考文献----------References----------
University Press, Princeton.
Analysis, Springer, New York.
参见----------See Also----------
Psi, VAR, SVAR, vec2var, SVEC
Psi,VAR,SVAR,vec2var,SVEC
实例----------Examples----------
data(Canada)
var.2c <- VAR(Canada, p = 2, type = "const")
Phi(var.2c, nstep=4)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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