| ceriodaphnia.group {CountsEPPM} | R Documentation |
Ceriodaphnia data
Description
Ceriodaphnia dubia are water fleas used to test the impact of effluents on water quality. The data are counts of young at varying effluent concentrations.
Usage
data(ceriodaphnia.group)Format
The format is: List of 5 $ vdose : num [1:5] 0 1.56 3.12 6.25 12.5 $ vdose2 : num [1:5] 0 2.44 9.77 39.06 156.25 $ fdose : Factor w/ 5 levels "0","1.5625","3.125",..: 1 2 3 4 5 $ twofdose : Factor w/ 2 levels "0","1": 1 1 2 2 1 $ number.young:List of 5 ..$ : num [1:32] 0 0 0 0 0 0 0 0 0 0 ... ..$ : num [1:36] 0 0 0 0 0 0 0 0 0 0 ... ..$ : num [1:45] 0 0 0 0 0 0 0 0 0 0 ... ..$ : num [1:37] 0 0 0 0 0 0 0 0 0 0 ... ..$ : num [1:17] 0 0 1 0 0 0 0 3 0 0 ...
Details
The data is used in Faddy and Smith (2011) as an example. Faddy and Smith (2011) is the main reference for the methods implemented. The data are grouped into number of fleas for each count value.
Source
Bailer, A., Oris, J. (1997). Estimating inhibition concentrations for different response scales using Generalized Linear Models. Environmental Toxicology and Chemistry, 16, 1554-1559. doi:10.1002/etc.5620160732.
References
Faddy M, Smith D. (2011). Analysis of count data with covariate dependence in both mean and variance. Journal of Applied Statistics, 38, 2683-2694. doi:10.1002/bimj.201100214.
Examples
data(ceriodaphnia.group)
print(ceriodaphnia.group)