Description Usage Arguments Value Author(s) See Also Examples
This is an internal function used within arfimaMLM
and arfimaOLS
. It is used to extract the variables marked with the suffixes .fd
, .xdif
, and .ydif
from formula
as well as .mean
from ecmformula
and create variable lists for the respective types of data manipulations.
1 | extractVars(formula,ecmformula=NULL)
|
formula |
An object of the class " |
ecmformula |
An object of the class " |
The function returns a list of character vectors containing variable names selected for subsequent data manipulation:
mean |
List of variables selected to calculate level means (i.e. variables originally augmented with suffixes |
fd |
List of variables selected for fractional differencing (i.e. variables originally augmented with suffixes |
xdif |
List of variables originally augmented with the suffix |
xdif |
List of variables originally augmented with the suffix |
Patrick Kraft
arfimaMLM
, arfimaOLS
, ArfimaMLM
.
1 2 3 4 5 6 | f1 <- y ~ x1.xdif + x2 + z1.fd + z2
f2 <- y.ydif ~ x1.xdif + x2 + z1.fd + z2.fd + (1+x1.xdif|time)
f3 <- y.mean ~ x1.mean
extractVars(formula = f1)
extractVars(formula = f2, ecmformula = f3)
|
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