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Static Method: out = zCO2 ()

Carbon Dioxide Uptake in Grass Plants


The CO2 data set has 84 rows and 5 columns of data from an experiment on the cold tolerance of the grass species Echinochloa crus-galli.



The CO2 uptake of six plants from Quebec and six plants from Mississippi was measured at several levels of ambient CO2 concentration. Half the plants of each type were chilled overnight before the experiment was conducted.


Potvin, C., Lechowicz, M. J. and Tardif, S. (1990). The statistical analysis of ecophysiological response curves obtained from experiments involving repeated measures. Ecology, 71, 1389–1400.

Pinheiro, J. C. and Bates, D. M. (2000). Mixed-effects Models in S and S-PLUS. New York: Springer.


t = octave.dataset.zCO2;

# TODO: Coplot
# TODO: Port the linear model to Octave