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I have implemented mathematical functions using a c# library. I basically need to output data by the RiskMatrixByFunds in the following format

key will contain Id and value will contain collection of string, double, double

For e.g

Id 1

value

'ArithmeticMean', 12.34, 3.44,
'AverageGain', 12.35, 3.45,
'AverageLoss', 12.36, 3.46,

I have used Dictionary structure that will contain the int and list of tuple collection. Here is the code below.

Kindly let me know if it can be enhanced. Any ideas on magic strings used. A better way to implement it

 public class RiskMatrix : IRiskMatrix
 

 public (double Monthly, double Annual) ArithmeticMean(IEnumerable<double> ReturnsList)
 
 double returnList = ReturnsList.Mean();
 return (Monthly: returnList, Annual: returnList * Math.Pow(12, 0.5));
 

 public (double Monthly, double Annual) AverageGain(IEnumerable<double> ReturnsList)
 

 double returnList = ReturnsList.GainMean();
 return (Monthly: returnList, Annual: returnList * Math.Pow(12, 0.5));
 

 public (double Monthly, double Annual) AverageLoss(IEnumerable<double> ReturnsList)
 
 double returnList = ReturnsList.LossMean();
 return (Monthly: returnList, Annual: returnList * Math.Pow(12, 0.5));
 


 public Dictionary<int, List<Tuple<string,double, double>>> RiskMatrixByFunds(Dictionary<int, IEnumerable<double>> ReturnsList)
 
 Dictionary<int, List<Tuple<string ,double, double>>> returnsList = new Dictionary<int, List<Tuple<string,double, double>>>();
 List <Tuple<string, double, double>> list = null;

 foreach (KeyValuePair<int, IEnumerable<double>> entry in ReturnsList)
 
 list = new List<Tuple<string, double, double>>();
 (double Monthly, double Annual) arithmeticMeanResult = ArithmeticMean(entry.Value);
 list.Add(new Tuple<string, double, double>("ArithmeticMean", arithmeticMeanResult.Monthly, arithmeticMeanResult.Annual));
 (double Monthly, double Annual) averageGainResult = AverageGain(entry.Value);
 list.Add(new Tuple<string, double, double>("AverageGain", averageGainResult.Monthly, averageGainResult.Annual));
 (double Monthly, double Annual) averageLossResult = AverageLoss(entry.Value);
 list.Add(new Tuple<string, double, double>("AverageLoss", averageLossResult.Monthly, averageLossResult.Annual));
 (double Monthly, double Annual) betaCorrelationresult = BetaCorrelation(entry.Value);

 returnsList.Add(entry.Key, list);
 
 return returnsList;