categoryReturns

Compute aggregate and periodic category returns

Syntax

[AggregateCategoryReturns,PeriodicCategoryReturns] = categoryReturns(brinsonAttributionObj)

Description

[AggregateCategoryReturns,PeriodicCategoryReturns] = categoryReturns(brinsonAttributionObj) computes the aggregate and periodic category (sector) returns for the portfolio and the benchmark.

Examples

Compute Category Returns Using brinsonAttribution Object

This example shows how to create a brinsonAttribution object and then use categoryReturns to compute the aggregate and periodic category returns for the portfolio and the benchmark.

Prepare Data

Create a table for the monthly prices for four assets.

 GM =[17.82;22.68;19.37;20.28];
 HD = [39.79;39.12;40.67;40.96];
 KO = [38.98;39.44;40.00;40.20];
 PG = [56.38;57.08;57.76;55.54];
 MonthlyPrices  = table(GM,HD,KO,PG);

Use tick2ret to define the monthly returns.

MonthlyReturns = tick2ret(MonthlyPrices.Variables)';
  [NumAssets,NumPeriods] = size(MonthlyReturns); 

Define the periods.

Period = ones(NumAssets*NumPeriods,1);
  for k = 1:NumPeriods
      Period(k*NumAssets+1:end,1) = Period(k*NumAssets,1) + 1;
  end

Define the categories for the four assets.

Name = repmat(string(MonthlyPrices.Properties.VariableNames(:)),NumPeriods,1);
  Categories = repmat(categorical([ ...
      "Consumer Discretionary"; ...
      "Consumer Discretionary"; ...
      "Consumer Staples"; ...
      "Consumer Staples"]),NumPeriods,1);

Define benchmark and portfolio weights.

BenchmarkWeight = repmat(1./NumAssets.*ones(NumAssets, 1),NumPeriods,1);
  PortfolioWeight = repmat([1;0;1;1]./3,NumPeriods,1);

Create AssetTable Input

Create AssetTable as the input for the brinsonAttribution object.

  AssetTable = table(Period, Name, ...
      MonthlyReturns(:), Categories, PortfolioWeight, BenchmarkWeight, ...
      VariableNames=["Period","Name","Return","Category","PortfolioWeight","BenchmarkWeight"])

AssetTable=12×6 table
    Period    Name     Return             Category           PortfolioWeight    BenchmarkWeight
    ______    ____    _________    ______________________    _______________    _______________

      1       "GM"      0.27273    Consumer Discretionary        0.33333             0.25      
      1       "HD"    -0.016838    Consumer Discretionary              0             0.25      
      1       "KO"     0.011801    Consumer Staples              0.33333             0.25      
      1       "PG"     0.012416    Consumer Staples              0.33333             0.25      
      2       "GM"     -0.14594    Consumer Discretionary        0.33333             0.25      
      2       "HD"     0.039622    Consumer Discretionary              0             0.25      
      2       "KO"     0.014199    Consumer Staples              0.33333             0.25      
      2       "PG"     0.011913    Consumer Staples              0.33333             0.25      
      3       "GM"      0.04698    Consumer Discretionary        0.33333             0.25      
      3       "HD"    0.0071306    Consumer Discretionary              0             0.25      
      3       "KO"        0.005    Consumer Staples              0.33333             0.25      
      3       "PG"    -0.038435    Consumer Staples              0.33333             0.25      

Create brinsonAttribution Object

Use brinsonAttribution with the brinsonAttribution object to compute aggregate and periodic category returns.

  BrinsonPAobj = brinsonAttribution(AssetTable)

BrinsonPAobj = 
  brinsonAttribution with properties:

                  NumAssets: 4
         NumPortfolioAssets: 3
         NumBenchmarkAssets: 4
                 NumPeriods: 3
              NumCategories: 2
                  AssetName: [4x1 string]
                AssetReturn: [4x3 double]
              AssetCategory: [4x3 categorical]
       PortfolioAssetWeight: [4x3 double]
       BenchmarkAssetWeight: [4x3 double]
    PortfolioCategoryReturn: [2x3 double]
    BenchmarkCategoryReturn: [2x3 double]
    PortfolioCategoryWeight: [2x3 double]
    BenchmarkCategoryWeight: [2x3 double]
            PortfolioReturn: 0.0598
            BenchmarkReturn: 0.0540
               ActiveReturn: 0.0059

Compute Category Returns

Use categoryReturns with the brinsonAttribution object to compute aggregate and periodic category (sector) returns.

[AggregateCategoryReturns, PeriodicCategoryReturns] = categoryReturns(BrinsonPAobj)

AggregateCategoryReturns=2×3 table
           Category           AggregatePortfolioReturn    AggregateBenchmarkReturn
    ______________________    ________________________    ________________________

    Consumer Discretionary             0.13805                    0.096876        
    Consumer Staples                 0.0081816                   0.0081816        

PeriodicCategoryReturns=6×4 table
    Period           Category           PortfolioReturn    BenchmarkReturn
    ______    ______________________    _______________    _______________

      1       Consumer Discretionary         0.27273            0.12794   
      1       Consumer Staples              0.012108           0.012108   
      2       Consumer Discretionary        -0.14594          -0.053161   
      2       Consumer Staples              0.013056           0.013056   
      3       Consumer Discretionary         0.04698           0.027055   
      3       Consumer Staples             -0.016717          -0.016717   

Input Arguments

brinsonAttributionObj — Brinson attribution model

object

Brinson attribution model, specified as a brinsonAttribution object.

Data Types: object

Output Arguments

AggregateCategoryReturns — Category returns aggregated over all periods

table

Category returns aggregated over all periods, returned as a table with the following columns:

• Category — Asset category

• AggregatePortfolioReturn — Aggregate portfolio returns

• AggregateBenchmarkReturn — Aggregate benchmark returns

PeriodicCategoryReturns — Category returns for each period

table

Category returns for each period, returned as a table with the following columns:

• Period — Time period numbers (1 for the first period, 2 for the second period, and so on)

• Category — Asset category

• PortfolioReturn — Portfolio returns

• BenchmarkReturn — Benchmark returns

References

[1] Brinson, G. P. and Fachler, N. “Measuring Non-US Equity Portfolio Performance.” Journal of Portfolio Management. Spring 1985: 73–76.

[2] Brinson, G. P., Hood, L. R., and Beebower, G. L. “Determinants of Portfolio Performance.” Financial Analysts Journal. Vol. 42, No. 4, 1986: 39–44.

[3] Menchero, J. “Multiperiod Arithmetic Attribution.” Financial Analysts Journal. Vol. 60, No. 4, 2004: 76–91.

[4] Tuttle, D. L., Pinto, J. E., and McLeavey, D. W. Managing Investment Portfolios: A Dynamic Process. Third Edition. CFA Institute, 2007.

Version History

Introduced in R2020b