Real data which are available on page 10 of Silvapulle and Sen (2005) and in a report prepared by Litton Bionetics Inc in 1984. These data were used in an experiment to find out whether vinylidene fluoride gives rise to liver damage. Since increased levels of serum enzyme are inherent in liver damage, the focus is on whether enzyme levels are affected by vinylidene fluoride. The variable of interest is the serum enzyme level. Three types of enzymes are inspected, namely SDH, SGOT, and SGPT. To study whether vinylidene fluoride has an influence on the three serum enzymes, four dosages of this substance are examined. In each of these four treatment groups, ten male Fischer-344 rats received the substance.
vinylideneA data frame with 40 observations on the following 4 variables.
SDHserum enzyme level of enzyme type SDH.
SGOTserum enzyme level of enzyme type SGOT.
SGPTserum enzyme level of enzyme type SGPT.
dosefactor with 4 levels (d1-d4) representing the 4 vinylidene fluoride concentrations.
Silvapulle MJ, Sen PK (2005). Constrained Statistical Inference. New Jersey: Wiley.