dichromate: Survival data set for _Daphnia magna_ exposed to dichromate...

dichromateR 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 in mg.L^{-1}.

time

A vector of class integer with the time points (in days from the beginning of the experiment t = 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.


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