> cov(X) X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14 X15 X16 X17 X18 X1 0.889020627 -0.02468878 0.001187636 0.078467144 0.236024208 0.06128918 0.098188549 -0.033751147 0.084504275 -0.034316940 0.17969676 -0.0646999518 -0.034631027 0.02235185 -0.044809383 -0.072845522 0.044436863 -0.0619581760 X2 -0.024688785 0.99067410 0.199537982 0.080856178 0.268921085 0.15667946 0.010847571 0.054444311 0.097351607 0.295256765 0.33270112 0.0425959503 0.314959495 -0.17888442 0.316966801 0.061005631 -0.056283026 0.3336164835 X3 0.001187636 0.19953798 1.003032159 0.286636059 0.278377691 0.19916333 0.095126213 0.113103320 -0.073883527 0.100156198 0.01525488 0.0128746175 0.258950480 -0.01703904 0.033340875 0.173301650 0.210701000 0.3576737363 X4 0.078467144 0.08085618 0.286636059 0.951435201 0.068664916 0.04477930 0.041447061 -0.199478686 -0.174450868 0.150331221 -0.22172244 0.0485213101 -0.111748887 -0.17602159 -0.035258675 -0.100385956 -0.112061085 0.0056784320 X5 0.236024208 0.26892109 0.278377691 0.068664916 0.896631631 -0.01076814 -0.101572740 0.002275177 -0.241421871 -0.017672102 0.10329686 -0.1034381305 0.125251665 -0.02280810 0.110637634 0.085917018 -0.077206948 -0.0167344453 X6 0.061289179 0.15667946 0.199163333 0.044779301 -0.010768139 1.10678657 0.059808671 0.151105044 0.078869937 -0.191086003 0.11722894 -0.2362307347 -0.043350639 -0.14776905 -0.049691790 0.090985933 -0.291466933 0.1209971236 X7 0.098188549 0.01084757 0.095126213 0.041447061 -0.101572740 0.05980867 1.001531190 0.071259942 0.251485618 -0.005483547 -0.18711942 0.1424709646 0.051697936 -0.18725956 0.234018801 0.108886543 0.383239251 0.1448507988 X8 -0.033751147 0.05444431 0.113103320 -0.199478686 0.002275177 0.15110504 0.071259942 0.962087423 0.048081696 -0.153756731 0.32475904 0.1729964460 -0.024096121 -0.19801281 0.035472514 -0.046409443 0.121345152 -0.0958717844 X9 0.084504275 0.09735161 -0.073883527 -0.174450868 -0.241421871 0.07886994 0.251485618 0.048081696 1.040436500 0.264690624 0.16181006 0.2672003433 0.285904000 -0.11869569 0.133045950 -0.001598342 0.264873414 0.0516582360 X10 -0.034316940 0.29525677 0.100156198 0.150331221 -0.017672102 -0.19108600 -0.005483547 -0.153756731 0.264690624 1.367143436 0.23039998 -0.0192505644 0.172128737 0.04751917 -0.007968432 -0.114331560 -0.003136789 0.0634160552 X11 0.179696761 0.33270112 0.015254881 -0.221722436 0.103296864 0.11722894 -0.187119415 0.324759038 0.161810064 0.230399984 1.31109047 0.2234827042 0.147449505 0.01028697 -0.169553144 -0.064705043 -0.017391645 0.0998518155 X12 -0.064699952 0.04259595 0.012874618 0.048521310 -0.103438130 -0.23623073 0.142470965 0.172996446 0.267200343 -0.019250564 0.22348270 1.0964000883 -0.003058901 -0.21604407 -0.096454003 -0.150053278 0.435301745 -0.0002166082 X13 -0.034631027 0.31495950 0.258950480 -0.111748887 0.125251665 -0.04335064 0.051697936 -0.024096121 0.285904000 0.172128737 0.14744951 -0.0030589005 0.736288989 -0.16959743 0.289391590 0.186156702 0.241463120 0.1555276594 X14 0.022351845 -0.17888442 -0.017039040 -0.176021589 -0.022808100 -0.14776905 -0.187259558 -0.198012814 -0.118695692 0.047519173 0.01028697 -0.2160440738 -0.169597428 0.98028545 -0.131233187 0.186314677 -0.223541102 -0.0111539344 X15 -0.044809383 0.31696680 0.033340875 -0.035258675 0.110637634 -0.04969179 0.234018801 0.035472514 0.133045950 -0.007968432 -0.16955314 -0.0964540030 0.289391590 -0.13123319 0.988934404 0.269839155 0.376729412 0.0150590593 X16 -0.072845522 0.06100563 0.173301650 -0.100385956 0.085917018 0.09098593 0.108886543 -0.046409443 -0.001598342 -0.114331560 -0.06470504 -0.1500532783 0.186156702 0.18631468 0.269839155 0.819578510 0.220105847 0.0725206520 X17 0.044436863 -0.05628303 0.210701000 -0.112061085 -0.077206948 -0.29146693 0.383239251 0.121345152 0.264873414 -0.003136789 -0.01739165 0.4353017448 0.241463120 -0.22354110 0.376729412 0.220105847 1.075661681 0.1732318095 X18 -0.061958176 0.33361648 0.357673736 0.005678432 -0.016734445 0.12099712 0.144850799 -0.095871784 0.051658236 0.063416055 0.09985182 -0.0002166082 0.155527659 -0.01115393 0.015059059 0.072520652 0.173231809 1.0546548943