brms (version 1.1.0)

inhaler: Clarity of inhaler instructions

Description

Ezzet and Whitehead (1991) analyse data from a two-treatment, two-period crossover trial to compare 2 inhalation devices for delivering the drug salbutamol in 286 asthma patients. Patients were asked to rate the clarity of leaflet instructions accompanying each device, using a 4-point ordinal scale.

Usage

inhaler

Format

A dataframe of 572 observations containing information on the following 5 variables.

Source

Ezzet, F., & Whitehead, J. (1991). A random effects model for ordinal responses from a crossover trial. Statistics in Medicine, 10(6), 901-907.

Examples

## Not run: 
# ## ordinal regression with family "sratio"
# fit1 <- brm(rating ~ treat + period + carry, 
#             data = inhaler, family = sratio(), 
#             prior = set_prior("normal(0,5)"))
# summary(fit1) 
# plot(fit1)
#        
# ## ordinal regression with family "cumulative" 
# ## and random intercept over subjects             
# fit2 <- brm(rating ~ treat + period + carry + (1|subject), 
#               data = inhaler, family = cumulative(), 
#               prior = set_prior("normal(0,5)"))
# summary(fit2) 
# plot(fit2)
# ## End(Not run)