public void Should_Return_Correct_Pearson_Correlation_When_People_Have_Common_Preferences()
{
const string entity1 = "Lisa Rose";
const string entity2 = "Gene Seymour";
var entity1Preferences = new Dictionary <string, double>
{
{ "Lady in the Water", 2.5 },
{ "Snakes on a Plane", 3.5 },
{ "Just My Luck", 3.0 },
{ "Superman Returns", 3.5 },
{ "You, Me and Dupree", 2.5 },
{ "The Night Listener", 3.0 }
};
var entity2Preferences = new Dictionary <string, double>
{
{ "Lady in the Water", 3 },
{ "Snakes on a Plane", 3.5 },
{ "Just My Luck", 1.5 },
{ "Superman Returns", 5 },
{ "You, Me and Dupree", 3.5 },
{ "The Night Listener", 3.0 }
};
var preferences = new Dictionary <string, Dictionary <string, double> >
{
{ entity1, entity1Preferences },
{ entity2, entity2Preferences }
};
var sim = new Similarity <string, string>();
var result = sim.GetPearsonCorrelation(preferences, entity1, entity2);
Assert.AreEqual(Math.Round(result, 12), 0.396059017191);
}