dichromate {morse} | R Documentation |
Survival data set for Daphnia magna exposed to dichromate during 21 days
Description
Survival data set of chronic laboratory toxicity tests with Daphnia magna freshwater invertebrate exposed to six concentrations of one oxidizing agent (potassium dichromate) during 21 days. Six concentrations were tested with one replicate of 50 organisms per concentration. Survival is monitored at 10 time points.
Usage
data(dichromate)
Format
A data frame with 60 observations on the following four variables:
replicate
A vector of class
numeric
with the replicate code (1
).conc
A vector of class
numeric
with dichromate concentrations inmg.L^{-1}
.time
A vector of class
integer
with the time points (in days from the beginning of the experimentt = 0
).Nsurv
A vector of class
integer
with the number of alive individuals at each time point for each concentration and each replicate.
References
Bedaux, J., Kooijman, SALM (1994) Statistical analysis of toxicity tests, based on hazard modeling, Environmental and Ecological Statistics, 1, 303-314.