CO2
CO2 Uptake Versus Concentration Data

### Description

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.

### Usage

    data(CO2)

Format
This data frame contains the following columns:
Value

Plant | a factor giving a unique identifier for each plant.
Type | origin of the plant - Quebec or Mississippi.
Treatment | treatment - chilled or nonchilled.
conc | ambient concentration of carbon dioxide (mL/L).
uptake | CO2 uptake (umol/m^2 sec).

Source
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.
Examples

    CO2.lis <- nlsList(uptake ~ CO2.func(conc, A, c0, lrc),
                       data = CO2, cluster = ~ Plant)
    CO2.nlme <- nlme(CO2.lis)

Package Sdatasets version 6.1.5-18
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