This function is a constructor for the cor_arma class, allowing for moving average terms only.
Usage
cor_ma(formula = ~1, q = 1, cov = FALSE)
Arguments
formula
A one sided formula of the form ~ t, or ~ t | g,
specifying a time covariate t and, optionally, a grouping factor g.
A covariate for this correlation structure must be integer valued.
When a grouping factor is present in formula, the co
q
A non-negative integer specifying the moving average (MA) order of the ARMA structure.
Default is 0.
cov
A flag indicating whether ARMA effects should be estimated by means
of residual covariance matrices
(currently only possible for stationary ARMA effects of order 1).
If FALSE (the default) a regression formulation
is used that is conside
Value
An object of class cor_arma containing solely moving average terms.