By Takeshi Amemiya
Complicated Econometrics is either a complete textual content for graduate scholars and a reference paintings for econometricians. it is going to even be priceless to these doing statistical research within the different social sciences. Its major gains are a radical therapy of cross-section versions, together with qualitative reaction types, censored and truncated regression versions, and Markov and period types, in addition to a rigorous presentation of huge pattern idea, classical least-squares and generalized least-squares idea, and nonlinear simultaneous equation types. even supposing the therapy is mathematically rigorous, the writer has hired the theorem-proof procedure with easy, intuitively available assumptions. this allows readers to appreciate the elemental constitution of every theorem and to generalize it for themselves looking on their wishes and talents. many straightforward functions of theorems are given both within the kind of examples within the textual content or as workouts on the finish of every bankruptcy on the way to show their crucial issues.
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Additional resources for Advanced Econometrics
5). 2 The F Test In this section we shall consider the test of the null hypothesis Q'fJ = c against the alternative hypothesis Q'fJ =I- c when it involves more than one constraint (that is, q> 1). We shall derive the Ftest as a simple transformation of the likelihood ratio test. Suppose that the likelihood function is in general given by L(~, 8), where ~ is a sample and (J is a vector of parameters. Let the null hypothesis be Ho: (J E So where So is a subset of the parameter space e and let the alternative hypothesis be HI : (J E SI where SI is another subset ofe.
The method works asymptotically because the variance ofufis approximately the same as tliatofu 1 when Tl and T2 arelarge, becausepconvergestocrdcr2 in probability. Goldfeld and Quandt (1978) conducted a Monte Carlo experiment that showed that, when crt =#= cr~, the asymptotic F test performs well, closely followed by the asymptotic likelihood ratio test, whereas the F test based on the assumption of equality of the variances could be considerably inferior. yp=x;p+up, > T) E[(y:- Yp)2lxp] = cr" + x;E(p· - pxp.
We shall derive the Ftest as a simple transformation of the likelihood ratio test. Suppose that the likelihood function is in general given by L(~, 8), where ~ is a sample and (J is a vector of parameters. Let the null hypothesis be Ho: (J E So where So is a subset of the parameter space e and let the alternative hypothesis be HI : (J E SI where SI is another subset ofe. Then the likelihood ratio test is defined by the following procedure: maxL(~, 8) ,eSo · H. 'f l Reject 0 I I\. == -m-ax-=---L-(-:-~,-8)- < g, Qp-e = (21tu 2)-T/2 e-T/2.