Ri = a + B*X + ei, where Ri is the stock return and an is the
anticipated excess return, is the single index model. B represents the
stock’s market sensitivity. The market excess return is X. (Rm-rf) The
company-specific surprise is ei. Finding the return covariance matrix is
our aim. We will provide the beta (B) and the covariance of ei in order
to accomplish the purpose.
## CITCRP CONED CONTIL DATGEN DEC DELTA
## [1,] -0.08906182 -0.0924325479 -0.08644938 -0.03294113 -0.07166573 -0.01200381
## [2,] -0.02947098 -0.0213220221 0.03962148 -0.10233449 -0.08098502 -0.04367536
## [3,] 0.02222799 0.0001459493 -0.02322229 0.01692842 -0.04144488 0.04005781
## [4,] 0.08137923 -0.0280423719 0.14407347 0.11922277 0.10229784 0.11357564
## [5,] -0.04312626 -0.0373788404 0.02232575 -0.01165793 -0.02788962 -0.06925976
## [6,] -0.00126376 0.0159743906 -0.05395791 -0.02491578 -0.03617703 0.01394154
## GENMIL GERBER IBM MOBIL PANAM
## [1,] -0.100413553 -0.028965238 -0.01280576 -0.021675972 0.06312884
## [2,] 0.001973487 0.144900665 -0.05166925 -0.031704502 -0.07498803
## [3,] -0.049582534 -0.075756917 -0.08963000 0.006102306 0.15303258
## [4,] 0.015865982 -0.044052752 0.09732727 0.024616945 0.04828272
## [5,] 0.031860393 -0.004401685 -0.05238371 -0.066068798 0.03852208
## [6,] -0.007140637 0.014969963 -0.01116196 -0.055338490 0.01944396
## PSNH TANDY TEXACO WEYER
## [1,] 0.008151819 -0.04037246 -0.03121181 -0.0790751380
## [2,] -0.020345243 -0.02681935 -0.02066688 -0.1429243732
## [3,] 0.022349580 0.05968252 -0.01983395 0.0436777086
## [4,] -0.014444627 -0.02327918 -0.04296475 0.0927777034
## [5,] 0.011764204 0.09376762 -0.07426696 -0.0853085904
## [6,] 0.037351739 -0.03333676 -0.03363874 -0.0002054953
## [,1] [,2] [,3] [,4] [,5] [,6]
## [1,] 0.004526617 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [2,] 0.000000000 0.002511069 0.00000000 0.00000000 0.000000000 0.000000000
## [3,] 0.000000000 0.000000000 0.02039461 0.00000000 0.000000000 0.000000000
## [4,] 0.000000000 0.000000000 0.00000000 0.01140139 0.000000000 0.000000000
## [5,] 0.000000000 0.000000000 0.00000000 0.00000000 0.006537662 0.000000000
## [6,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.008161795
## [7,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [8,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [9,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [10,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [11,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [12,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [13,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [14,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [15,] 0.000000000 0.000000000 0.00000000 0.00000000 0.000000000 0.000000000
## [,7] [,8] [,9] [,10] [,11] [,12]
## [1,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [2,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [3,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [4,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [5,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [6,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [7,] 0.00393017 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [8,] 0.00000000 0.005930261 0.000000000 0.000000000 0.00000000 0.00000000
## [9,] 0.00000000 0.000000000 0.002540858 0.000000000 0.00000000 0.00000000
## [10,] 0.00000000 0.000000000 0.000000000 0.004107716 0.00000000 0.00000000
## [11,] 0.00000000 0.000000000 0.000000000 0.000000000 0.01498815 0.00000000
## [12,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.01187757
## [13,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [14,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [15,] 0.00000000 0.000000000 0.000000000 0.000000000 0.00000000 0.00000000
## [,13] [,14] [,15]
## [1,] 0.00000000 0.00000000 0.000000000
## [2,] 0.00000000 0.00000000 0.000000000
## [3,] 0.00000000 0.00000000 0.000000000
## [4,] 0.00000000 0.00000000 0.000000000
## [5,] 0.00000000 0.00000000 0.000000000
## [6,] 0.00000000 0.00000000 0.000000000
## [7,] 0.00000000 0.00000000 0.000000000
## [8,] 0.00000000 0.00000000 0.000000000
## [9,] 0.00000000 0.00000000 0.000000000
## [10,] 0.00000000 0.00000000 0.000000000
## [11,] 0.00000000 0.00000000 0.000000000
## [12,] 0.00000000 0.00000000 0.000000000
## [13,] 0.01121942 0.00000000 0.000000000
## [14,] 0.00000000 0.00464578 0.000000000
## [15,] 0.00000000 0.00000000 0.004133323