Description Usage Arguments Value Author(s) Examples
Calculates the local description (getLocalDescription) for each observation of a data set. getLocalDescription is computed for each observation of data. To increase performance the package parrallel is used.
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data |
A data set to be evaluated for outliers. A matrix or a data frame may be handed over. |
k |
The number of observations used to define the environment by the k nearest neighbors. Only [k*alpha] of those observations are used for the definition of the projection space and for the covariance estimation used for the calculation of core distances. |
alpha |
A robustness parameter to adjust the number of oberservations used for the definition of the projection space. The optimal alpha depends on the expected number of outliers. Unless k is very small (<10), or no additional information is available, alpha should be kept at 0.5. |
ods |
Matrix of orthogonal distances. The columns refere to the projection, the rows to the observation. |
cds |
Matrix of core distances. The columns refere to the projection, the rows to the observation. |
ecds |
Matrix of Euclidean core distances. The columns refere to the projection, the rows to the observation. |
core |
Matrix, documenting the [k*alpha] observations used for projections (columns). 1 referes to used, 0 to not used. |
knn |
Matrix, documenting the k nearest neighbors for each observation under evaluation. 1 referes to the knn, 0 to not not part of knn. |
Thomas Ortner (thomas.ortner@tuwien.ac.at)
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