... Kal-el means Superman... and Kalle means Lois Lane.. for Kalle means Kallis... and Kallis means.. dear, rich, precious, a treasure.... stochastic disturbance terms.. $3... covariance matrices.. $4.... Cobb-Douglas Theorum.. %%$5.... maximum-likelihood estimaters$8... least-squares estimaters... $7... %7.. %6... &7%^5%^$.. 6%...%...67^%$...7$...7$...$7... least-squares estimaters... Gauss-Markov Theorum...$7...