private static List <MarginRisk> CalculateRiskMargins(Currency calculationCurrency, FxRatesProvider ratesProvider, List <Sensitivity> sensitivities)
{
List <SensitivityRisk> risks = sensitivities.Select(x => x.Risk).Distinct().OrderBy(x => x.ToString()).ToList();
List <MarginRisk> riskMargins = new List <MarginRisk>(risks.Count);
foreach (SensitivityRisk risk in risks)
{
List <Sensitivity> sensitivitiesByRisk = sensitivities.Where(x => x.Risk == risk).ToList();
List <SensitivityCategory> sensitivityCategories = sensitivitiesByRisk.Select(x => x.Category).Distinct().OrderBy(x => x.ToString()).ToList();
List <MarginSensitivity> sensitivityMargins = new List <MarginSensitivity>(sensitivityCategories.Count);
foreach (SensitivityCategory category in sensitivityCategories)
{
List <Sensitivity> sensitivitiesByClass = sensitivitiesByRisk.Where(x => x.Category == category).ToList();
MarginSensitivity sensitivityMargin = s_MarginCalculators[category].CalculateMargin(calculationCurrency, ratesProvider, risk, category, sensitivitiesByClass);
sensitivityMargins.Add(sensitivityMargin);
}
Amount riskMarginAmount = Amount.Sum(sensitivityMargins.Select(x => x.Value), calculationCurrency);
riskMargins.Add(MarginRisk.Of(risk, riskMarginAmount, sensitivityMargins));
}
return(riskMargins);
}
public override MarginSensitivity CalculateMargin(Currency calculationCurrency, FxRatesProvider ratesProvider, SensitivityRisk risk, SensitivityCategory category, List <Sensitivity> sensitivities)
{
if (calculationCurrency == null)
{
throw new ArgumentNullException(nameof(calculationCurrency));
}
if (ratesProvider == null)
{
throw new ArgumentNullException(nameof(ratesProvider));
}
if (!Enum.IsDefined(typeof(SensitivityRisk), risk))
{
throw new InvalidEnumArgumentException("Invalid sensitivity risk specified.");
}
if (!Enum.IsDefined(typeof(SensitivityCategory), category))
{
throw new InvalidEnumArgumentException("Invalid sensitivity category specified.");
}
if (sensitivities == null)
{
throw new ArgumentNullException(nameof(sensitivities));
}
List <IBucket> buckets = sensitivities.Select(x => x.Bucket).Distinct().OrderBy(x => x.Name).ToList();
List <MarginBucket> bucketMargins = new List <MarginBucket>(buckets.Count);
foreach (IBucket bucket in buckets)
{
List <Sensitivity> sensitivitiesByBucket = sensitivities.Where(x => x.Bucket == bucket).ToList();
List <MarginWeighting> weightingMargins = CalculateMarginsWeighting(SensitivityCategory.Curvature, sensitivitiesByBucket);
Amount sumSquared = Amount.Sum(weightingMargins.Select(x => Amount.Square(x.Value)), calculationCurrency);
Amount sumCorrelated = CalculateCorrelatedSumWeights(calculationCurrency, risk, weightingMargins);
Amount bucketMarginAmount = Amount.SquareRoot(sumSquared + sumCorrelated);
bucketMargins.Add(MarginBucket.Of(bucket, bucketMarginAmount, weightingMargins));
}
Amount marginNonResidual = CalculateMarginByBuckets(calculationCurrency, risk, false, bucketMargins);
Amount marginResidual = CalculateMarginByBuckets(calculationCurrency, risk, true, bucketMargins);
Amount sensitivityMarginAmount = ModelParameters.GetCurvatureScaleFactor(risk) * (marginNonResidual + marginResidual);
return(MarginSensitivity.Of(SensitivityCategory.Curvature, sensitivityMarginAmount, bucketMargins));
}
public override MarginSensitivity CalculateMargin(Currency calculationCurrency, FxRatesProvider ratesProvider, SensitivityRisk risk, SensitivityCategory category, List <Sensitivity> sensitivities)
{
if (calculationCurrency == null)
{
throw new ArgumentNullException(nameof(calculationCurrency));
}
if (ratesProvider == null)
{
throw new ArgumentNullException(nameof(ratesProvider));
}
if (!Enum.IsDefined(typeof(SensitivityRisk), risk))
{
throw new InvalidEnumArgumentException("Invalid sensitivity risk specified.");
}
if (!Enum.IsDefined(typeof(SensitivityCategory), category))
{
throw new InvalidEnumArgumentException("Invalid sensitivity category specified.");
}
if (sensitivities == null)
{
throw new ArgumentNullException(nameof(sensitivities));
}
List <MarginWeighting> weightingMargins = CalculateMarginsWeighting(SensitivityCategory.BaseCorrelation, sensitivities);
Amount sumSquared = Amount.Sum(weightingMargins.Select(x => Amount.Square(x.Value)), calculationCurrency);
Amount sumCorrelated = CalculateCorrelatedSumWeights(calculationCurrency, weightingMargins);
Amount amount = Amount.SquareRoot(sumSquared + sumCorrelated);
MarginBucket bucketMargin = MarginBucket.Of(Placeholder.Instance, amount, weightingMargins);
return(MarginSensitivity.Of(SensitivityCategory.BaseCorrelation, amount, (new List <MarginBucket> {
bucketMargin
})));
}
public override MarginSensitivity CalculateMargin(Currency calculationCurrency, FxRatesProvider ratesProvider, SensitivityRisk risk, SensitivityCategory category, List <Sensitivity> sensitivities)
{
if (calculationCurrency == null)
{
throw new ArgumentNullException(nameof(calculationCurrency));
}
if (ratesProvider == null)
{
throw new ArgumentNullException(nameof(ratesProvider));
}
if (!Enum.IsDefined(typeof(SensitivityRisk), risk))
{
throw new InvalidEnumArgumentException("Invalid sensitivity risk specified.");
}
if (!Enum.IsDefined(typeof(SensitivityCategory), category))
{
throw new InvalidEnumArgumentException("Invalid sensitivity category specified.");
}
if (sensitivities == null)
{
throw new ArgumentNullException(nameof(sensitivities));
}
List <IBucket> buckets = sensitivities.Select(x => x.Bucket).Distinct().OrderBy(x => x.Name).ToList();
List <MarginBucket> bucketMargins = new List <MarginBucket>(buckets.Count);
Dictionary <IBucket, Dictionary <String, Decimal> > thresholdFactors = new Dictionary <IBucket, Dictionary <String, Decimal> >();
foreach (IBucket bucket in buckets)
{
List <Sensitivity> sensitivitiesByBucket = sensitivities.Where(x => x.Bucket == bucket).ToList();
thresholdFactors[bucket] = sensitivitiesByBucket
.GroupBy(x => new { x.Bucket, x.Qualifier })
.ToDictionary(x => x.Key.Qualifier, x => CalculateThresholdFactor(calculationCurrency, ratesProvider, risk, category, x.ToList()));
List <MarginWeighting> weightingMargins = CalculateMarginsWeighting(category, thresholdFactors[bucket], sensitivitiesByBucket);
Amount sumSquared = Amount.Sum(weightingMargins.Select(x => Amount.Square(x.Value)), calculationCurrency);
Amount sumCorrelated = CalculateCorrelatedSumWeights(calculationCurrency, risk, weightingMargins, thresholdFactors[bucket]);
Amount bucketMarginAmount = Amount.SquareRoot(sumSquared + sumCorrelated);
bucketMargins.Add(MarginBucket.Of(bucket, bucketMarginAmount, weightingMargins));
}
List <MarginBucket> bucketMarginsNonResidual = bucketMargins.Where(x => !x.Bucket.IsResidual).ToList();
Amount sumSquaredNonResidual = Amount.Sum(bucketMarginsNonResidual.Select(x => Amount.Square(x.Value)), calculationCurrency);
List <MarginBucket> bucketMarginsResidual = bucketMargins.Where(x => x.Bucket.IsResidual).ToList();
Amount sumSquaredResidual = Amount.Sum(bucketMarginsResidual.Select(x => Amount.Square(x.Value)), calculationCurrency);
Amount sumCorrelatedNonResidual;
if ((risk == SensitivityRisk.Rates) && (category == SensitivityCategory.Delta))
{
Dictionary <IBucket, Decimal> bucketThresholdFactors = thresholdFactors.ToDictionary(x => x.Key, x => x.Value.Values.Single());
sumCorrelatedNonResidual = CalculateCorrelatedSumBuckets(calculationCurrency, risk, bucketThresholdFactors, bucketMarginsNonResidual);
}
else
{
sumCorrelatedNonResidual = CalculateCorrelatedSumBuckets(calculationCurrency, risk, bucketMarginsNonResidual);
}
Amount sensitivityMarginAmount = Amount.SquareRoot(sumSquaredNonResidual + sumCorrelatedNonResidual) + Amount.SquareRoot(sumSquaredResidual);
return(MarginSensitivity.Of(category, sensitivityMarginAmount, bucketMargins));
}