This is a simulated three-class problem with 21 variables, and considered to be a difficult pattern recognition problem.

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A data frame with 500 observations on the following 22 variables.

`y`

a numeric vector

`x.1`

a numeric vector

`x.2`

a numeric vector

`x.3`

a numeric vector

`x.4`

a numeric vector

`x.5`

a numeric vector

`x.6`

a numeric vector

`x.7`

a numeric vector

`x.8`

a numeric vector

`x.9`

a numeric vector

`x.10`

a numeric vector

`x.11`

a numeric vector

`x.12`

a numeric vector

`x.13`

a numeric vector

`x.14`

a numeric vector

`x.15`

a numeric vector

`x.16`

a numeric vector

`x.17`

a numeric vector

`x.18`

a numeric vector

`x.19`

a numeric vector

`x.20`

a numeric vector

`x.21`

a numeric vector

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