edu.harvard.seas.iis.abilities.analysis
Class MovementUtils

java.lang.Object
  edu.harvard.seas.iis.abilities.analysis.MovementUtils

public class MovementUtils
extends java.lang.Object

Author:

kgajos Various tools for manipulating Movement objects

Constructor Summary

MovementUtils()

Method Summary

static double[]	computeFittsCoefficients(java.util.Collection<Movement> movements)
static double[]	getMeanAndStdevForProperty(java.util.Collection<Movement> movements, java.lang.String propertyName) Computes a mean and stdev for a given property over a collection of movements
static double[]	getPropertyAsArray(java.util.Collection<Movement> movements, java.lang.String propertyName) for a collection of movements, extracts a particular (numerical) property from each, and returns an array of the values
static double	getRMSdeviationFromFitts(java.util.Collection<Movement> movements, double a, double b) Computes root mean square difference between the actual movement time and the movement time predicted by the Fitts' model with parameters a and b.

Methods inherited from class java.lang.Object

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

Constructor Detail

MovementUtils

public MovementUtils()

Method Detail

computeFittsCoefficients

public static double[] computeFittsCoefficients(java.util.Collection<Movement> movements)

Parameters:

movements -

Returns:

[intercept, slope]

getPropertyAsArray

public static double[] getPropertyAsArray(java.util.Collection<Movement> movements,
                                          java.lang.String propertyName)

for a collection of movements, extracts a particular (numerical) property from each, and returns an array of the values

Parameters:

movements -

propertyName -

Returns:

getMeanAndStdevForProperty

public static double[] getMeanAndStdevForProperty(java.util.Collection<Movement> movements,
                                                  java.lang.String propertyName)

Computes a mean and stdev for a given property over a collection of movements

Parameters:

movements -

propertyName -

Returns:

getRMSdeviationFromFitts

public static double getRMSdeviationFromFitts(java.util.Collection<Movement> movements,
                                              double a,
                                              double b)

Computes root mean square difference between the actual movement time and the movement time predicted by the Fitts' model with parameters a and b.

Parameters:

movements -

a -

b -

Returns: