public MainViewModel()
{
SelectionViewModel
.WhenAnyValue(a => a.SelectedValue)
.Where(a => a != null)
.Select(method => (a: method, method.GetParameters().Count()))
.CombineLatest(I1.WhenAnyValue(_ => _.Output), I2.WhenAnyValue(a => a.Output), (a, b, c) => NewMethod(b, c, v => a.a.Invoke(null, v), a.Item2))
.SelectMany(a => a.ToObservable())
.ObserveOnDispatcher()
.Subscribe(normal =>
{
O.Mean = normal.Mean;
O.StandardDeviation = normal.StdDev;
});