public void GroupStdDev()
{
var sexos = from a in Database.Query <ArtistEntity>()
group a.Name.Length by a.Sex into g
select new
{
Key = g.Key,
StdDev = (double?)g.StdDev(),
StdDevInMemory = GetStdDev(g.ToList()),
StdDevP = (double?)g.StdDevP(),
StdDevPInMemory = GetStdDevP(g.ToList()),
};
var list = sexos.ToList();
list.ForEach(a => Assert2.AreSimilar(a.StdDev, a.StdDevInMemory));
list.ForEach(a => Assert2.AreSimilar(a.StdDevP, a.StdDevPInMemory));
}