public void TestSimple() 
	    {
		    User user1 = GetUser("test1", 1.0, 2.0, 3.0);
		    User user2 = GetUser("test2", 2.0, 3.0, 1.0);
		    DataModel dataModel = GetDataModel(user1, user2);
		    double correlation = new SpearmanCorrelation(dataModel).GetUserCorrelation(user1, user2);
		    AssertCorrelationEquals(-0.5, correlation);
	    }
	    public void TestFullCorrelation2() 
	    {
		    User user1 = GetUser("test1", 1.0, 2.0, 3.0);
		    User user2 = GetUser("test2", 4.0, 5.0, 6.0);
		    DataModel dataModel = GetDataModel(user1, user2);
		    double correlation = new SpearmanCorrelation(dataModel).GetUserCorrelation(user1, user2);
		    AssertCorrelationEquals(1.0, correlation);
	    }