The 'paramecium' data frame has 25 rows and 2 columns of data from an experiment that grow paramecium caudatum
data(paramecium)
The data frame contains the following columns:
day a numeric vector of days since the start of the experiment
density a numeric vector of mean number of individuals in 0.5 ml of medium of four different cultures started simultaneously
Neal, D. (2004). Introduction to Population Biology. Cambridge University Press.