glmtoolbox (version 0.1.12)

paramecium: Growth of Paramecium aurelium

Description

Data on the growth of three colonies of Paramecium aurelium in a nutritive medium containing salt solution. In each experiment, 20 Paramecia were placed in a tube with a constant temperature medium. Starting on the second day, the number of individuals is counted every day.

Usage

data(paramecium)

Format

A data frame with 57 rows and 3 variables:

Days

a numeric vector indicating the time, in number of days.

Colony

a factor with three levels: "A", "B" and "C".

Number

a numeric vector indicating the number of individuals in the colony.

References

Svetliza C.F., Paula G.A. (2003) Diagnostics in Nonlinear Negative Binomial Models. Communications in Statistics - Theory and Methods, 32, 1227-1250.

Examples

data(paramecium)
dev.new()
with(paramecium,plot(Days,Number,ylab="Number of individuals",pch=20,
     xlab="Time, in days",
     col=ifelse(Colony=="A","black",ifelse(Colony=="B","blue","red"))))
legend(c(0,680),col=c("black","blue","red"),legend=c("A","B","C"),
       pch=20,title="Colony",bty="n")