Electrical Length 2 dataset 1: Description. This problem consists of four input variables and the available data set is comprised of a representative number of well distributed examples. In this case, the learning methods are expected to obtain a considerable number of rules. Therefore, this problem involves a larger search space (high complexity). 2: Type. Regression 3: Origin. Real world 4: Instances. 1056 5: Features. 4 6: Missing values. No 7: Header. @relation ele-2 @attribute X1 real [0.5,11.0] @attribute X2 real [0.15,8.55] @attribute X3 real [1.64,142.5] @attribute X4 real [1.0,165.0] @attribute Y real [64.470001,8546.030273] @inputs X1, X2, X3, X4 @outputs Y