plasma {SCBmeanfd}

Plasma citrate data

Description

Plasma citrate concentrations measured on 10 human subjects on the same day. The measurements on an individual were taken each hour from 8:00AM to 9:00PM. A possible statistical analysis is to estimate the population mean plasma citrate concentration as a function of time of day.

Usage

data(plasma)

Format

A matrix with 10 rows (corresponding to subjects) and 14 columns (corresponding to hours).

Source

Andersen, A. H., Jensen, E. B. and Schou, G. (1981). Two-way analysis of variance with correlated errors. International Statistical Review 49, 153–157.

Hart, T. D. and Wehrly, T. E. (1986). Kernel regression estimation using repeated measurements data. Journal of the American Statistical Association 81, 1080–1088.

Examples

## Not run: 
data(plasma)
matplot(x = 8:21, y = t(plasma), cex = .75, type = "l", col = 1, lty = 1,
  lwd = .5, xlab = "Time of day (hour)", ylab = "Concentration", 
  main = "Plasma citrate data")
lines(8:21, colMeans(plasma), col = 2, lwd = 1.5)
legend("topright", col = 2, lty = 1, lwd = 1.5, legend = "Mean")
## End(Not run)