Flury (version 0.1-3)

midge: Midge Data

Description

Data on the Antenna length and Wing length of two species of Midge

Usage

data(midge)

Format

A data frame with 15 observations on the following 3 variables.

Species

a factor with levels Af (Amerohelea fasciata) Apf (A. pseudofasciata)

Ant.Length

a numeric vector, Antenna length (mm)

Wing.Length

a numeric vector, Wing length (mm)

Source

Grogan, W.L, and W.W. Wirth (1981) “A new American genus of predaceous midges related to Palpomyia and Bezzia (Diptera: Ceratopogonidae)” Proceedings of the Biological Society of Washington 94:1279-1305

Details

These data concern two newly discovered species of American predaceous midges. Interest surrounds the possibility of classifying these two species based on external measurements alone. Two possible measures are recorded here.

References

Flury, B.D. (1997) A First Course in Multivariate Statistics, Springer NY

Examples

data(midge)
## Not run: 
# with(midge, plot(Ant.Length, Wing.Length,
# col = as.numeric(Species), pch = 16, main = "Scatterplot of midge data"))
# legend("bottomright", pch = 16, col = c(1,2), legend = c("Af", "Apf"))## End(Not run)