de.lmu.ifi.dbs.elki.utilities.scaling.outlier
Class MinusLogStandardDeviationScaling

java.lang.Object
  de.lmu.ifi.dbs.elki.logging.AbstractLoggable
      de.lmu.ifi.dbs.elki.utilities.scaling.outlier.StandardDeviationScaling
          de.lmu.ifi.dbs.elki.utilities.scaling.outlier.MinusLogStandardDeviationScaling

All Implemented Interfaces:

Parameterizable, OutlierScalingFunction, ScalingFunction

public class MinusLogStandardDeviationScaling
extends StandardDeviationScaling
implements OutlierScalingFunction

Scaling that can map arbitrary values to a probability in the range of [0:1]. Transformation is done using the formula max(0, erf(lambda * (x - mean) / (stddev * sqrt(2)))) Where mean can be fixed to a given value, and stddev is then computed against this mean.

Author:

Erich Schubert

Field Summary

Fields inherited from class de.lmu.ifi.dbs.elki.utilities.scaling.outlier.StandardDeviationScaling

factor, fixedmean, lambda, LAMBDA_ID, mean, MEAN_ID

Fields inherited from class de.lmu.ifi.dbs.elki.logging.AbstractLoggable

debug, logger

Constructor Summary

MinusLogStandardDeviationScaling(Parameterization config)
Constructor, adhering to Parameterizable

Method Summary

double	getScaled(double value) Transform a given value using the scaling function.
void	prepare(Database<?> db, Result result, OutlierResult or) Prepare is called once for each data set, before getScaled() will be called.

Methods inherited from class de.lmu.ifi.dbs.elki.utilities.scaling.outlier.StandardDeviationScaling

getMax, getMin

Methods inherited from class de.lmu.ifi.dbs.elki.logging.AbstractLoggable

debugFine, debugFiner, debugFinest, exception, progress, verbose, warning

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface de.lmu.ifi.dbs.elki.utilities.scaling.ScalingFunction

getMax, getMin

Constructor Detail

MinusLogStandardDeviationScaling

public MinusLogStandardDeviationScaling(Parameterization config)

Constructor, adhering to Parameterizable

Parameters:

config - Parameterization

Method Detail

getScaled

public double getScaled(double value)

Description copied from interface: ScalingFunction

Transform a given value using the scaling function.

Specified by:

getScaled in interface ScalingFunction

Overrides:

getScaled in class StandardDeviationScaling

Parameters:

value - Original value

Returns:

Scaled value

prepare

public void prepare(Database<?> db,
                    Result result,
                    OutlierResult or)

Description copied from interface: OutlierScalingFunction

Prepare is called once for each data set, before getScaled() will be called. This function can be used to extract global parameters such as means, minimums or maximums from the Database, Result or Annotation.

Specified by:

prepare in interface OutlierScalingFunction

Overrides:

prepare in class StandardDeviationScaling

Parameters:

db - Database used

result - Result object

or - Outlier result to use