I am porting over some code from Microsoft Excel to C#. The Excel expression uses the TINV function. Is there an equivalent function in C# or .NET? If not, what C# code is necessary to reimplement this function?
If you are using .NET 4.0 you can leverage the Chart class found in the System.Web.DataVisualization assembly (you will also need to add System.Web). E.G:
var chart = new System.Web.UI.DataVisualization.Charting.Chart();
double result = chart.DataManipulator.Statistics.InverseTDistribution(.05, 15);
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Documentation: