cor_arma
class
allowing for autoregressive effects of the response only.
cor_arr(formula = ~1, r = 1)
~ 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 correlation structure
is assumed to apply only to observations within the same grouping level;
observations with different grouping levels are assumed to be uncorrelated.
Defaults to ~ 1
, which corresponds to using the order of the observations
in the data as a covariate, and no groups.cor_arma
containing solely
autoregressive response terms.
cor_arma
cor_arr(~visit|patient, r = 2)
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