net.sourceforge.openforecast.tests

Class SimpleExponentialSmoothingTest

java.lang.Object

junit.framework.Assert

junit.framework.TestCase

net.sourceforge.openforecast.tests.OpenForecastTestCase

net.sourceforge.openforecast.tests.SimpleExponentialSmoothingTest

All Implemented Interfaces:

junit.framework.Test

public class SimpleExponentialSmoothingTest
extends OpenForecastTestCase

Tests the implementation of the Simple Exponential Smoothing forecasting model.

Since:

0.4

Constructor Summary

Constructors

Constructor and Description
SimpleExponentialSmoothingTest(java.lang.String name) Constructor required by the JUnit framework.

Method Summary

Modifier and Type	Method and Description
void	testConstantSimpleExponentialSmoothing() A simple exponential smoothing test where the observed data is constant.
void	testMusicStoreExample() An example taken from "Business Statistics", 4th Edition by Daniel and Terrell, page 605.
void	testSimpleExponentialSmoothing() A somewhat more realistic test where the results are known (and were calculated independently of the model).

Methods inherited from class junit.framework.TestCase

assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertEquals, assertFalse, assertFalse, assertNotNull, assertNotNull, assertNotSame, assertNotSame, assertNull, assertNull, assertSame, assertSame, assertTrue, assertTrue, countTestCases, fail, fail, failNotEquals, failNotSame, failSame, format, getName, run, run, runBare, setName, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleExponentialSmoothingTest

public SimpleExponentialSmoothingTest(java.lang.String name)

Constructor required by the JUnit framework.

Method Detail

testConstantSimpleExponentialSmoothing

public void testConstantSimpleExponentialSmoothing()

A simple exponential smoothing test where the observed data is constant. This should result in the same constant forecast for any value of the smoothing constant.

testSimpleExponentialSmoothing

public void testSimpleExponentialSmoothing()

A somewhat more realistic test where the results are known (and were calculated independently of the model). Validates that the SimpleExponentialSmoothingModel returns the expected set of results for the given inputs.

See Also:

Engineering Statistics Handbook, 6.4.3.1 Single Exponential Smoothing

testMusicStoreExample

public void testMusicStoreExample()

An example taken from "Business Statistics", 4th Edition by Daniel and Terrell, page 605. This example tests the exponential smoothing formulation proposed by Roberts. Example 13.5.1. The sales of musical instruments by a local music store for the past 10 months are as follows: 74, 69, 80, 91, 76, 83, 79, 87, 89, and 92.

See Also:

SimpleExponentialSmoothingModel