marker_term | R Documentation |
Creates Data for One Type of Marker
marker_term(formula, id, data, time_fixef, time_rng)
formula |
a two-sided |
id |
the variable for the id of each individual. |
data |
a |
time_fixef |
the time-varying fixed effects. See .e.g.
|
time_rng |
the time-varying random effects. See .e.g.
|
The time_fixef
should likely not include an intercept as this is
often included in formula
. Use
poly_term(degree = 0, raw = TRUE, intercept = TRUE)
if you want only
a random intercept.
An object of class marker_term
containing longitudinal data.
# load in the data library(survival) data(pbc, package = "survival") # re-scale by year pbcseq <- transform(pbcseq, day_use = day / 365.25) pbc <- transform(pbc, time_use = time / 365.25) # create the marker terms m1 <- marker_term( log(bili) ~ 1, id = id, data = pbcseq, time_fixef = bs_term(day_use, df = 5L), time_rng = poly_term(day_use, degree = 1L, raw = TRUE, intercept = TRUE)) m2 <- marker_term( albumin ~ 1, id = id, data = pbcseq, time_fixef = bs_term(day_use, df = 5L), time_rng = poly_term(day_use, degree = 1L, raw = TRUE, intercept = TRUE))
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