A dataset containing sonar measurements used to discriminate rocks from mines.
data(sonar)A data frame with 208 observations on 61 variables. The variables V1-V60 represent the energy within a certain frequency band, and are to be used as predictors. The variable y is a class label, 1 for 'rock' and -1 for 'mine'.
Gorman, R. P., and Sejnowski, T. J. (1988). "Analysis of Hidden Units in a Layered Network Trained to Classify Sonar Targets" in Neural Networks, Vol. 1, pp. 75-89.