brms (version 0.9.1)

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

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

## 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)