Description
The labor data frame has 358 rows and 4 columns of the
change in pain over time for several 83 women in labor.source
Davis CS (1991). Semi--parametric and non--parametric methods for the analysis of repeated measurements with applications to clinical trials. Statistics in Medicine 10, 1959--80.Details
The labor pain data were reported by Davis (1991) and successively analyzed by Jung (1996) and Geraci and Bottai (2007). The data
set consists of repeated measurements of self--reported amount of pain on N = 83 women in labor, of which 43 were randomly assigned to a pain medication group and 40 to a placebo group. The response was measured every 30 min on a 100--mm line, where 0 means no pain and 100 means extreme pain. A nearly monotone pattern of missing data was found for the response variable and the maximum number of measurements for each woman was six.References
Geraci M and Bottai M (2007). Quantile regression for longitudinal data using the asymmetric Laplace distribution. Biostatistics 8(1), 140--154.Jung S (1996). Quasi--likelihood for median regression models. Journal of the American Statistical Association 91, 251--7.