private void ComputeBeta()
{
Console.WriteLine("calcule beta for : " + name);
List <double> benchPerfs = index.GetPerformances();
List <DateTime> datesBench = index.GetDates();
List <DateTime> dates = GetDates();
beta3M = BetaPeriod(25, benchPerfs, datesBench, dates);
beta6M = BetaPeriod(50, benchPerfs, datesBench, dates);
beta1Y = BetaPeriod(100, benchPerfs, datesBench, dates);
beta3Y = BetaPeriod(300, benchPerfs, datesBench, dates);
beta5Y = BetaPeriod(500, benchPerfs, datesBench, dates);
beta = BetaPeriod(0, benchPerfs, datesBench, dates);
}