
SSJ V. 2.6. 

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Description
Interface Summary  

ObservationListener  Represents an object that can listen to observations broadcast by statistical probes. 
Class Summary  

StatProbe  The objects of this class are statistical probes or collectors, which are elementary devices for collecting statistics. 
Tally  This type of statistical collector takes a sequence of realvalued observations and can return the average, the variance, a confidence interval for the theoretical mean, etc. 
TallyHistogram  This class is an extension of Tally which gives a more detailed view
of the observations statistics. 
TallyStore  This class is a variant of Tally for which the individual
observations are stored in a list implemented as a
DoubleArrayList . 
This package provides elementary tools for collecting statistics and computing
confidence intervals. The base class
StatProbe
implements common methods needed by all probes.
Its subclass Tally
collects data as a sequence of observations
X_{1}, X_{2},..., and computes
sample averages, sample standard deviations, and confidence intervals
based on the normality assumption.
The class TallyStore
is
similar, but it also stores the individual observations in a list
implemented as a DoubleArrayList
.
This permits one to compute more quantities and to use the methods
provided by COLT for computing descriptive statistics.
The class Accumulate
computes integrals and averages with respect to time.
This class is in package simevents because its operation depends
on the simulation clock.
All classes that represent statistical probes
support the observer design pattern, wellknown .
This pattern facilitates the separation of data generation (by the
simulation program) from data processing (for statistical reports and
displays). This can be very helpful in particular in large simulation
programs or libraries, where different objects may need to process
the same data in different ways.
A statistical probe maintains a list of registered
ObservationListener
objects, and broadcasts information to all its registered
observers whenever appropriate. Any object that implements the interface
ObservationListener
can register as an observer. For an example, see the program
QueueObs in the directory examples.
Subpackages of package stat provide matrices of Tally's and lists of Tally's.

SSJ V. 2.6. 

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