Data understanding and preparation
To start, we will load these four packages. The data is in the MASS
package:
> library(caret) > library(MASS) > library(neuralnet) > library(vcd)
The neuralnet
package will be used for the building of the model and caret
for the data preparation. The vcd
package will assist us in data visualization. Let's load the data and examine its structure:
> data(shuttle) > str(shuttle) 'data.frame':256 obs. of 7 variables: $ stability: Factor w/ 2 levepicels "stab","xstab": 2 2 2 2 2 2 2 2 2 2 ... $ error : Factor w/ 4 levels "LX","MM","SS",..: 1 1 1 1 1 1 1 1 1 1 ... $ sign : Factor w/ 2 levels "nn","pp": 2 2 2 2 2 2 1 1 1 1 ... $ wind : Factor w/ 2 levels "head","tail": 1 1 1 2 2 2 1 1 1 2 ... $ magn : Factor w/ 4 levels "Light","Medium",..: 1 2 4 1 2 4 1 2 4 1 ... $ vis : Factor w/ 2 levels "no","yes": 1 1 1 1 1 1 1 1 1 1 ... ...