R Dataset / Package quantreg / Mammals
On this Picostat.com statistics page, you will find information about the Mammals data set which pertains to Garland(1983) Data on Running Speed of Mammals. The Mammals data set is found in the quantreg R package. Try to load the Mammals data set in R by issuing the following command at the console data("Mammals"). This may load the data into a variable called Mammals. If R says the Mammals data set is not found, you can try installing the package by issuing this command install.packages("quantreg") and then attempt to reload the data with library("quantreg") followed by data("Mammals"). Perhaps strangley, if R gives you no output after entering a command, it means the command succeeded. If it succeeded you can see the data by typing Mammals at the command-line which should display the entire dataset.
If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the Mammals R data set. The size of this file is about 2,041 bytes.
Garland(1983) Data on Running Speed of Mammals
Observations on the maximal running speed of mammal species and their body mass.
A data frame with 107 observations on the following 4 variables.
Used by Chappell (1989) and Koenker, Ng and Portnoy (1994) to illustrate the fitting of piecewise linear curves.
Garland, T. (1983) The relation between maximal running speed and body mass in terrestrial mammals, J. Zoology, 199, 1557-1570.
Koenker, R., P. Ng and S. Portnoy, (1994) Quantile Smoothing Splines” Biometrika, 81, 673-680.
Chappell, R. (1989) Fitting Bent Lines to Data, with Applications ot Allometry, J. Theo. Biology, 138, 235-256.
data(Mammals) attach(Mammals) x <- log(weight) y <- log(speed) plot(x,y, xlab="Weight in log(Kg)", ylab="Speed in log(Km/hour)",type="n") points(x[hoppers],y[hoppers],pch = "h", col="red") points(x[specials],y[specials],pch = "s", col="blue") others <- (!hoppers & !specials) points(x[others],y[others], col="black",cex = .75) fit <- rqss(y ~ qss(x, lambda = 1),tau = .9) plot(fit)
Dataset imported from https://www.r-project.org.
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