//Alpha = Perf annualisée fond - B*perf anualisée (indice)
private double AlphaPeriod(int period)
{
double A = VALUE_IF_ERROR, P = 0, Pi = VALUE_IF_ERROR;
double B = 0;
switch (period)
{
case 0:
B = beta;
P = perfAT;
Pi = index.GetATPerf();
break;
case 25: B = beta3M;
P = perf3M;
Pi = index.Get3MPerf();
break;
case 50: B = beta6M;
P = perf6M;
Pi = index.Get6MPerf();
break;
case 100: B = beta1Y;
P = perf1Y;
Pi = index.Get1YPerf();
break;
case 300: B = beta3Y;
P = perf3Y;
Pi = index.Get3YPerf();
break;
case 500: B = beta5Y;
P = perf5Y;
Pi = index.Get5YPerf();
break;
}
if (B != VALUE_IF_ERROR && Pi != VALUE_IF_ERROR)
{
A = P - B * Pi;
}
return(A);
}