confintROB (version 1.1-1)

medication: The medication data set

Description

Often used for didactic purposes (Singer & Willett, 2003), and originally discussed in Tomarken, Shelton, Elkins, and Anderson (1997). During seven days, three times a day (from time = 0 to time = 6.667), a sample of n = 64 adults (identified by the variable id) were randomly assigned to either a treatment group (treat=1) or a control group (treat=0) and were required to report their mood (pos).

Usage

data(medication)

Format

`medication` a data.frame with 5 columns and 1242 rows:

obs

row number

id

participant number

treat

treatment assignment, 1= treatment; 0= control

time

time from 0 to 6.667, with increments of 0.333

pos

the positive mood score

References

Tomarken, A. J., Shelton, R. C., Elkins, L., & Anderson, T. (1997). Sleep deprivation and anti-depressant medication: unique effects on positive and negative affect. In American Psychological Society Meeting, Washington, DC.

Examples

data(medication)
str(medication)

# Fit mixed-effects model with lme4
library(lme4)
model.ML <- lmer(pos ~ treat * time + (time | id), data = medication,
                 REML = FALSE)
summary(model.ML)

# \donttest{
# Fit robust mixed-effects model with robustlmm
library(robustlmm)
model.RSE <- rlmer(pos ~ treat * time + (time | id), data = medication,
                   method = "DAStau")
compare(model.ML, model.RSE)

# Compute confidence intervals
set.seed(1)
ci <- confintROB(model.RSE, boot.type = "wild", nsim = 100)
ci
# }