Package org.apache.commons.math.estimation

Class WeightedMeasurement

  • All Implemented Interfaces:
    Serializable
    @Deprecated
public abstract class WeightedMeasurement
extends Object
implements Serializable
    Deprecated.
    as of 2.0, everything in package org.apache.commons.math.estimation has been deprecated and replaced by package org.apache.commons.math.optimization.general
    This class represents measurements in estimation problems.

    This abstract class implements all the methods needed to handle measurements in a general way. It defines neither the getTheoreticalValue nor the getPartial methods, which should be defined by sub-classes according to the specific problem.

    The getTheoreticalValue and getPartial methods must always use the current estimate of the parameters set by the solver in the problem. These parameters can be retrieved through the EstimationProblem.getAllParameters method if the measurements are independent of the problem, or directly if they are implemented as inner classes of the problem.

    The instances for which the ignored flag is set through the setIgnored method are ignored by the solvers. This can be used to reject wrong measurements at some steps of the estimation.

    Since:
    1.2
    See Also:
    EstimationProblem, Serialized Form

    • Constructor Detail

      • WeightedMeasurement

        public WeightedMeasurement​(double weight,
                           double measuredValue)
        Deprecated.
        Simple constructor. Build a measurement with the given parameters, and set its ignore flag to false.
        Parameters:
        weight - weight of the measurement in the least squares problem (two common choices are either to use 1.0 for all measurements, or to use a value proportional to the inverse of the variance of the measurement type)
        measuredValue - measured value

      • WeightedMeasurement

        public WeightedMeasurement​(double weight,
                           double measuredValue,
                           boolean ignored)
        Deprecated.
        Simple constructor. Build a measurement with the given parameters
        Parameters:
        weight - weight of the measurement in the least squares problem
        measuredValue - measured value
        ignored - true if the measurement should be ignored

    • Method Detail

      • getWeight

        public double getWeight()
        Deprecated.
        Get the weight of the measurement in the least squares problem
        Returns:
        weight

      • getMeasuredValue

        public double getMeasuredValue()
        Deprecated.
        Get the measured value
        Returns:
        measured value

      • getResidual

        public double getResidual()
        Deprecated.
        Get the residual for this measurement The residual is the measured value minus the theoretical value.
        Returns:
        residual

      • getTheoreticalValue

        public abstract double getTheoreticalValue()
        Deprecated.
        Get the theoretical value expected for this measurement

        The theoretical value is the value expected for this measurement if the model and its parameter were all perfectly known.

        The value must be computed using the current estimate of the parameters set by the solver in the problem.

        Returns:
        theoretical value

      • getPartial

        public abstract double getPartial​(EstimatedParameter parameter)
        Deprecated.
        Get the partial derivative of the theoretical value according to the parameter.

        The value must be computed using the current estimate of the parameters set by the solver in the problem.

        Parameters:
        parameter - parameter against which the partial derivative should be computed
        Returns:
        partial derivative of the theoretical value

      • setIgnored

        public void setIgnored​(boolean ignored)
        Deprecated.
        Set the ignore flag to the specified value Setting the ignore flag to true allow to reject wrong measurements, which sometimes can be detected only rather late.
        Parameters:
        ignored - value for the ignore flag

      • isIgnored

        public boolean isIgnored()
        Deprecated.
        Check if this measurement should be ignored
        Returns:
        true if the measurement should be ignored