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by: Dwight Marquardt IV


Dwight Marquardt IV
GPA 3.65

Eric Belasco

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About this Document

Eric Belasco
Class Notes
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This 2 page Class Notes was uploaded by Dwight Marquardt IV on Thursday October 22, 2015. The Class Notes belongs to AAEC 6311 at Texas Tech University taught by Eric Belasco in Fall. Since its upload, it has received 28 views. For similar materials see /class/226375/aaec-6311-texas-tech-university in Agriculture Education at Texas Tech University.

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Popular in Agriculture Education




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Date Created: 10/22/15
Systems of Equations Y1l310x0 B11x1l312x2 81 Y2 B20X0 B21x1l322x2 82 Y3 I330X0 Jr531X14rl332X2 93 AAEC ZH emr genera 2252008 Motivating Example z Livestock Performance and Health Indicators Assume the following model K XIB 5 Where or D rm tit Y DMFC ADG MORT VCPH Em l X 0 V3I5i lX Z The specification of Z largely impacts estimation and defines interaction between dependent variables Multivariate MLE Normal maximum likelihood has the following likelihood function Llll2l iexp7 Y 7XB2 Y7XB Lksiilllriim7XB2 K7XB As with any other MLE LR tests can be used to test different specifications Covariance Matrix Speci cation 4 2 Hi 0 sirnilartooLs estimation 2 o a o 0 Individual equations no cross n 0 0 a 0 correlationresiduaisuneorreiatedgt o o 0 oz 2 1 an u u gt Allows forconstantcovanance E a a on 5 betweenpammetasmote wecan a on a a impose mic qu an Ha He 3 2 51 an an an v Allowsforlevelsotho E influencethecov Ce 52 X 52366 5266 a anan or correlation between parameters 4 Extreme Winter Weather example Weather not a regressor so impacm error term gt Higher MORT gt Higher DMFC 7 More energy used to keep animal Warm and not gain Weig t gt Lower ADG 7 Feed cannot be increased to fule account for increased energy usage since Weather conditions limit feed deliveries gt Uncertain VCPH 7 more sick animals but vet cannot make as many visits Residuals across equations likely correlated 5 Superior Genetics example 17 Genetics are unobservable characteristics to the researcher while not to the producer gt Low MORT and VCPH more robust genes gt High ADG and Low DMFC this is exactly What beef cows are bred for This starts to point towards hypothesized signs of correlation or covariance


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