public void TestFromCorrelation()
{
User user1 = GetUser("test1", 1.0, 2.0);
User user2 = GetUser("test2", 2.0, 5.0);
User user3 = GetUser("test3", 3.0, 6.0);
DataModel dataModel = GetDataModel(user1, user2, user3);
ItemCorrelation otherCorrelation = new PearsonCorrelation(dataModel);
ItemCorrelation itemCorrelation = new GenericItemCorrelation(otherCorrelation, dataModel);
AssertCorrelationEquals(1.0,
itemCorrelation.GetItemCorrelation(dataModel.GetItem("0"), dataModel.GetItem("0")));
AssertCorrelationEquals(0.960768922830523,
itemCorrelation.GetItemCorrelation(dataModel.GetItem("0"), dataModel.GetItem("1")));
}
public void TestSimple()
{
Item item1 = new GenericItem <String>("1");
Item item2 = new GenericItem <String>("2");
Item item3 = new GenericItem <String>("3");
Item item4 = new GenericItem <String>("4");
List <GenericItemCorrelation.ItemItemCorrelation> correlations =
new List <GenericItemCorrelation.ItemItemCorrelation>(4);
correlations.Add(new GenericItemCorrelation.ItemItemCorrelation(item1, item2, 0.5));
correlations.Add(new GenericItemCorrelation.ItemItemCorrelation(item2, item1, 0.6));
correlations.Add(new GenericItemCorrelation.ItemItemCorrelation(item1, item1, 0.5));
correlations.Add(new GenericItemCorrelation.ItemItemCorrelation(item1, item3, 0.3));
GenericItemCorrelation itemCorrelation = new GenericItemCorrelation(correlations);
Assert.AreEqual(1.0, itemCorrelation.GetItemCorrelation(item1, item1));
Assert.AreEqual(0.6, itemCorrelation.GetItemCorrelation(item1, item2));
Assert.AreEqual(0.6, itemCorrelation.GetItemCorrelation(item2, item1));
Assert.AreEqual(0.3, itemCorrelation.GetItemCorrelation(item1, item3));
Assert.IsTrue(Double.IsNaN(itemCorrelation.GetItemCorrelation(item3, item4)));
}