Description Usage Format Source References Examples
The rise in abundance of algae in coastal waters is thought to be due to increases in nutrients such as nitrate and other forms of nitrogen. Researchers gathered data to gauge the evidence that nitrates in the discharges of rivers around the world are associated with human population density.
1 |
A data frame with 42 observations on the following 11 variables.
River
a character vector indicating the river
Country
a factor variable with 26 levels
Discharge
the estimated annual average discharge of the river into an ocean (m^3 per second)
Runoff
estimated annual average runoff from the watershed (liters/(sec x km^2))
Area
watershed area (km^2)
Density
density of people (people/km^2)
NO3
nitrate concentration (muM/l)
Export
nitrate export (product of runoff times nitrate concentration)
Dep
deposition (proportional to product of nitratrate precipitation times precipitation)
NPrec
nitrate precipitation (mumol NO_3/(sec x km^2))
Prec
precipitation (cm/year)
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
Cole, J.L., Peierls, B.L., Caraco, N.F. and Pace, M.L. (1993). Nitrogen Loading of Rivers as a Human-driven Process, in McDonnell, M.J. and Pickett, S.T.A. (eds.) Humans as Components of Ecosystems: The Ecology of Subtle Human Effects and Populated Areas, Springer-Verlag.
1 |
'data.frame': 42 obs. of 11 variables:
$ River : chr "Adige" "Amazon" "Caragh" "Columbia" ...
$ Country : Factor w/ 26 levels "Argentina","Australia",..: 12 22 11 23 17 23 3 10 14 5 ...
$ Discharge: num 2.23e+02 1.75e+05 7.29 7.90e+03 6.50e+03 ...
$ Runoff : num 18.3 24.8 45.6 11.8 8.1 ...
$ Area : num 1220 7050000 160 670000 805000 ...
$ Density : num 102 1 7.15 10 90 ...
$ NO3 : num 67 3 3.6 26.6 46 ...
$ Export : num 1224.7 74.5 164 313.6 371.4 ...
$ Dep : num 1237.5 120.6 86.5 62.8 826.4 ...
$ NPrec : num 46 2.1 2.6 2 45 ...
$ Prec : num 84.8 181.1 104.9 99.1 57.9 ...
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.