CreditNonQualifyingDeltaMargin20.java

package org.drip.sample.simmcrnq;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.drip.analytics.support.CaseInsensitiveHashMap;
import org.drip.numerical.common.FormatUtil;
import org.drip.service.env.EnvManager;
import org.drip.simm.foundation.MarginEstimationSettings;
import org.drip.simm.margin.RiskMeasureAggregateCR;
import org.drip.simm.margin.SensitivityAggregateCR;
import org.drip.simm.parameters.RiskMeasureSensitivitySettingsCR;
import org.drip.simm.product.BucketSensitivityCR;
import org.drip.simm.product.RiskFactorTenorSensitivity;
import org.drip.simm.product.RiskMeasureSensitivityCR;

/*
 * -*- mode: java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 */

/*!
 * Copyright (C) 2018 Lakshmi Krishnamurthy
 * 
 *  This file is part of DRIP, a free-software/open-source library for buy/side financial/trading model
 *      libraries targeting analysts and developers
 *      https://lakshmidrip.github.io/DRIP/
 *  
 *  DRIP is composed of four main libraries:
 *  
 *  - DRIP Fixed Income - https://lakshmidrip.github.io/DRIP-Fixed-Income/
 *  - DRIP Asset Allocation - https://lakshmidrip.github.io/DRIP-Asset-Allocation/
 *  - DRIP Numerical Optimizer - https://lakshmidrip.github.io/DRIP-Numerical-Optimizer/
 *  - DRIP Statistical Learning - https://lakshmidrip.github.io/DRIP-Statistical-Learning/
 * 
 *  - DRIP Fixed Income: Library for Instrument/Trading Conventions, Treasury Futures/Options,
 *      Funding/Forward/Overnight Curves, Multi-Curve Construction/Valuation, Collateral Valuation and XVA
 *      Metric Generation, Calibration and Hedge Attributions, Statistical Curve Construction, Bond RV
 *      Metrics, Stochastic Evolution and Option Pricing, Interest Rate Dynamics and Option Pricing, LMM
 *      Extensions/Calibrations/Greeks, Algorithmic Differentiation, and Asset Backed Models and Analytics.
 * 
 *  - DRIP Asset Allocation: Library for model libraries for MPT framework, Black Litterman Strategy
 *      Incorporator, Holdings Constraint, and Transaction Costs.
 * 
 *  - DRIP Numerical Optimizer: Library for Numerical Optimization and Spline Functionality.
 * 
 *  - DRIP Statistical Learning: Library for Statistical Evaluation and Machine Learning.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *      you may not use this file except in compliance with the License.
 *   
 *  You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *      distributed under the License is distributed on an "AS IS" BASIS,
 *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  
 *  See the License for the specific language governing permissions and
 *      limitations under the License.
 */

/**
 * CreditNonQualifyingDeltaMargin20 illustrates the Computation of the CR SIMM 2.0 Delta Margin for a Bucket
 *  of Non-Qualifying Credit Exposure Sensitivities. The References are:
 *  
 *  - Andersen, L. B. G., M. Pykhtin, and A. Sokol (2017): Credit Exposure in the Presence of Initial Margin,
 *      https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2806156, eSSRN.
 *  
 *  - Albanese, C., S. Caenazzo, and O. Frankel (2017): Regression Sensitivities for Initial Margin
 *      Calculations, https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2763488, eSSRN.
 *  
 *  - Anfuso, F., D. Aziz, P. Giltinan, and K. Loukopoulus (2017): A Sound Modeling and Back-testing
 *      Framework for Forecasting Initial Margin Requirements,
 *      https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2716279, eSSRN.
 *  
 *  - Caspers, P., P. Giltinan, R. Lichters, and N. Nowaczyk (2017): Forecasting Initial Margin Requirements
 *      - A Model Evaluation https://papers.ssrn.com/sol3/papers.cfm?abstract_id=2911167, eSSRN.
 *  
 *  - International Swaps and Derivatives Association (2017): SIMM v2.0 Methodology,
 *      https://www.isda.org/a/oFiDE/isda-simm-v2.pdf.
 * 
 * @author Lakshmi Krishnamurthy
 */

public class CreditNonQualifyingDeltaMargin20
{

    private static final void AddTenorSensitivity (
        final Map<String, Double> tenorSensitivityMap,
        final double notional,
        final String tenor)
        throws Exception
    {
        if (tenorSensitivityMap.containsKey (tenor))
        {
            tenorSensitivityMap.put (
                tenor,
                tenorSensitivityMap.get (tenor) + notional * (Math.random() - 0.5)
            );
        }
        else
        {
            tenorSensitivityMap.put (
                tenor,
                notional * (Math.random() - 0.5)
            );
        }
    }

    private static final RiskFactorTenorSensitivity CurveTenorSensitivityMap (
        final double notional)
        throws Exception
    {
        Map<String, Double> tenorSensitivityMap = new HashMap<String, Double>();

        AddTenorSensitivity (
            tenorSensitivityMap,
            notional,
            "1Y"
        );

        AddTenorSensitivity (
            tenorSensitivityMap,
            notional,
            "2Y"
        );

        AddTenorSensitivity (
            tenorSensitivityMap,
            notional,
            "3Y"
        );

        AddTenorSensitivity (
            tenorSensitivityMap,
            notional,
            "5Y"
        );

        AddTenorSensitivity (
            tenorSensitivityMap,
            notional,
            "10Y"
        );

        return new RiskFactorTenorSensitivity (tenorSensitivityMap);
    }

    private static final void DisplayComponentTenorSensitivity (
        final String componentName,
        final RiskFactorTenorSensitivity tenorSensitivityMap)
        throws Exception
    {
        System.out.println();

        System.out.println ("\t|--------------||");

        System.out.println ("\t|  " + componentName + " DELTA   ||");

        System.out.println ("\t|--------------||");

        System.out.println ("\t|              ||");

        System.out.println ("\t|  L -> R:     ||");

        System.out.println ("\t|    - Tenor   ||");

        System.out.println ("\t|    - Delta   ||");

        System.out.println ("\t|--------------||");

        for (Map.Entry<String, Double> tenorSensitivityEntry :
            tenorSensitivityMap.sensitivityMap().entrySet())
        {
            System.out.println (
                "\t| " +
                tenorSensitivityEntry.getKey() + " => " +
                FormatUtil.FormatDouble (tenorSensitivityEntry.getValue(), 2, 2, 1.) + " ||"
            );
        }

        System.out.println ("\t|--------------||");

        System.out.println();
    }

    private static final void ComponentRiskFactorTenorSensitivity (
        final Map<String, RiskFactorTenorSensitivity> tenorSensitivityMap,
        final double notional,
        final String componentName)
        throws Exception
    {
        RiskFactorTenorSensitivity ustRiskFactorSensitivity = CurveTenorSensitivityMap (notional);

        tenorSensitivityMap.put (
            componentName,
            ustRiskFactorSensitivity
        );

        DisplayComponentTenorSensitivity (
            componentName,
            ustRiskFactorSensitivity
        );
    }

    private static final void DisplayRiskMeasureAggregate (
        final RiskMeasureAggregateCR riskMeasureAggregateCR)
        throws Exception
    {
        System.out.println ("\t||--------------------------------------------||");

        System.out.println ("\t||   CR RISK CLASS AGGREGATE MARGIN METRICS   ||");

        System.out.println ("\t||--------------------------------------------||");

        System.out.println (
            "\t|| Core Delta SBA Variance     => " +
            FormatUtil.FormatDouble (riskMeasureAggregateCR.coreSBAVariance(), 10, 0, 1.) + " ||"
        );

        System.out.println (
            "\t|| Residual Delta SBA Variance => " +
            FormatUtil.FormatDouble (riskMeasureAggregateCR.residualSBAVariance(), 10, 0, 1.) + " ||"
        );

        System.out.println (
            "\t|| Delta SBA                   => " +
            FormatUtil.FormatDouble (riskMeasureAggregateCR.sba(), 10, 0, 1.) + " ||"
        );

        System.out.println ("\t||--------------------------------------------||");

        System.out.println();
    }

    private static final void DeltaMarginCovarianceEntry (
        final int bucketIndex,
        final SensitivityAggregateCR crDeltaAggregate)
        throws Exception
    {
        System.out.println ("\t||-------------------------------------||");

        System.out.println (
            "\t|| " + FormatUtil.FormatDouble (bucketIndex, 2, 0, 1.) +
            "  RISK FACTOR MARGIN COVARIANCE  ||"
        );

        System.out.println ("\t||-------------------------------------||");

        System.out.println ("\t||                                     ||");

        System.out.println ("\t||    - L -> R:                        ||");

        System.out.println ("\t||        - Component Pair             ||");

        System.out.println ("\t||        - Covariance                 ||");

        System.out.println ("\t||-------------------------------------||");

        Map<String, Double> componentMarginCovarianceMap = crDeltaAggregate.componentMarginCovarianceMap();

        Set<String> componentPairSet = componentMarginCovarianceMap.keySet();

        for (String componentPair : componentPairSet)
        {
            System.out.println (
                "\t|| " + componentPair + " => " +
                FormatUtil.FormatDouble (componentMarginCovarianceMap.get (componentPair), 9, 0, 1.) +
                    "               ||"
            );
        }

        System.out.println ("\t||-------------------------------------||");

        System.out.println();
    }

    public static final void main (
        final String[] argumentArray)
        throws Exception
    {
        EnvManager.InitEnv ("");

        double notional = 100.;
        int[] bucketIndexArray = {
             1,
             2,
        };
        String[][] bucketComponentGrid = {
            {"01a", "01b", "01c", "01d", "01e", "01f"},
            {"02a", "02b", "02c", "02d", "02e", "02f"},
        };

        Map<String, BucketSensitivityCR> bucketSensitivityMap = new HashMap<String, BucketSensitivityCR>();

        for (int bucketIndex : bucketIndexArray)
        {
            Map<String, RiskFactorTenorSensitivity> tenorSensitivityMap = new
                CaseInsensitiveHashMap<RiskFactorTenorSensitivity>();

            for (String componentName : bucketComponentGrid[bucketIndex - 1])
            {
                ComponentRiskFactorTenorSensitivity (
                    tenorSensitivityMap,
                    notional,
                    componentName
                );
            }

            bucketSensitivityMap.put (
                "" + bucketIndex,
                new BucketSensitivityCR (tenorSensitivityMap)
            );
        }

        RiskMeasureSensitivityCR riskClassSensitivity = new RiskMeasureSensitivityCR (bucketSensitivityMap);

        MarginEstimationSettings marginEstimationSettings = MarginEstimationSettings.CornishFischer
            (MarginEstimationSettings.POSITION_PRINCIPAL_COMPONENT_COVARIANCE_ESTIMATOR_ISDA);

        RiskMeasureSensitivitySettingsCR riskMeasureSensitivitySettings =
            RiskMeasureSensitivitySettingsCR.ISDA_CRNQ_DELTA_20();

        RiskMeasureAggregateCR riskMeasureAggregate = riskClassSensitivity.linearAggregate (
            riskMeasureSensitivitySettings,
            marginEstimationSettings
        );

        for (int bucketIndex : bucketIndexArray)
        {
            DeltaMarginCovarianceEntry (
                bucketIndex,
                riskMeasureAggregate.bucketAggregateMap().get ("" + bucketIndex).sensitivityAggregate()
            );
        }

        DisplayRiskMeasureAggregate (riskMeasureAggregate);

        EnvManager.TerminateEnv();
    }
}