Description Usage Arguments Details Value See Also Examples
Function to both oversample by SMOTE the minority class and undersample the majority class
1 | smote_and_undersample(data, y, fp = 1, ratio = 1, k = 5)
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data |
a data frame or matrix. Rows: examples; columns: features |
y |
a factor with the labels. 0:majority class, 1: minority class. |
fp |
multiplicative factor for the SMOTE oversampling of the minority class. If fp<1 no oversampling is performed. |
ratio |
ratio of the #majority/#minority |
k |
number of the nearest neighbours for SMOTE oversampling (def. 5) |
If n is the number of examples of the minority class, then fp*n new synthetic examples are generated according to the SMOTE algorithm and ratio*(fp*n + n) negative examples are undersampled form the majority class.
A list with two entries:
X |
a data frame including the original minority class examples plus the SMOTE oversampled and undersampled data |
Y |
a factor with the labels of the data frame |
1 2 | d <- imbalanced.data.generator(n.pos=20, n.neg=1000, n.features=12, n.inf.features=2, sd=1, seed=1);
res <- smote_and_undersample(d$data, d$label, fp = 2, ratio = 3);
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