| % File src/library/datasets/man/co2.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{co2} |
| \docType{data} |
| \alias{co2} |
| \title{Mauna Loa Atmospheric CO2 Concentration} |
| \description{ |
| Atmospheric concentrations of CO\eqn{_2}{2} are expressed in parts per |
| million (ppm) and reported in the preliminary 1997 SIO manometric mole |
| fraction scale. |
| } |
| \usage{co2} |
| \format{ |
| A time series of 468 observations; monthly from 1959 to 1997. |
| } |
| \details{ |
| The values for February, March and April of 1964 were missing and have |
| been obtained by interpolating linearly between the values for January |
| and May of 1964. |
| } |
| \source{ |
| Keeling, C. D. and Whorf, T. P., |
| Scripps Institution of Oceanography (SIO), |
| University of California, |
| La Jolla, California USA 92093-0220. |
| |
| \url{ftp://cdiac.esd.ornl.gov/pub/maunaloa-co2/maunaloa.co2}. |
| } |
| \references{ |
| Cleveland, W. S. (1993) |
| \emph{Visualizing Data}. |
| New Jersey: Summit Press. |
| } |
| \examples{ |
| require(graphics) |
| plot(co2, ylab = expression("Atmospheric concentration of CO"[2]), |
| las = 1) |
| title(main = "co2 data set") |
| } |
| \keyword{datasets} |