ceriodaphnia.group: Ceriodaphnia data

In CountsEPPM: Mean and Variance Modeling of Count 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)

Example output

$vdose
[1]  0.0000  1.5625  3.1250  6.2500 12.5000

$vdose2
[1]   0.000000   2.441406   9.765625  39.062500 156.250000

$fdose
[1] 0      1.5625 3.125  6.25   12.5  
Levels: 0 1.5625 3.125 6.25 12.5

$twofdose
[1] 0 0 1 1 0
Levels: 0 1

$number.young
$number.young[[1]]
 [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 2 0 1 1 1

$number.young[[2]]
 [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 0 0 0 1 1 0 1 0 0 2 0 0 2

$number.young[[3]]
 [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 4 0 0 1 0
[39] 1 1 0 0 0 0 1

$number.young[[4]]
 [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 3 0 2 2 0 1

$number.young[[5]]
 [1] 0 0 1 0 0 0 0 3 0 0 3 0 1 1 0 0 1

CountsEPPM documentation built on May 1, 2019, 10:25 p.m.