Measurements of the CO2 uptake for six Echinochloa crus-galli plants from Quebec and six plants from Mississippi as a function of ambient CO2 concentration. Half the plants of each type were chilled before the measurements were taken.
This data frame contains the following columns:
These data are given in Potvin, C. and Lechowicz, M.J. (1990), "The statistical analysis of ecophysiological response curves obtained from experiments involving repeated measures", Ecology, 71, 1389-1400.
CO2.lis <- nlsList(uptake ~ CO2.func(conc, A, c0, lrc), data = CO2, cluster = ~ Plant) CO2.nlme <- nlme(CO2.lis)