pain {lqmix}

Pain Data

Description

The pain data frame is made by a total of 357 rows and 4 columns providing information on pain of 83 women in labor followed for a maximum of 6 measurement occasions

Usage

data(pain)

Format

A data frame with 357 observations on the following 5 variables:

id

woman id

meas

a numeric vector of self-reported pain scores on a 100mm line

trt

a dummy variable with values 1 for subjects who received a pain medication and 0 for subjects who received a placebo

time

a numeric vector of times (minutes since randomization) at which pain was measured

Details

The data set consists of repeated measurements of self-reported pain on n = 83 women. 43 women were randomly assigned to a pain medication group and 40 to a placebo group. The response was measured every 30 minutes on a 100-mm line: 0 means no pain and 100 means extreme pain. The number of measurements for each woman varies from 1 to 6. Data are severely skewed, and the skewness changes magnitude, and even sign, over time.

References

Davis, Charles S. "Semi-parametric and non-parametric methods for the analysis of repeated measurements with applications to clinical trials." Statistics in medicine 10.12 (1991): 1959-1980.