Quiz  de Econometría, código 06216. Elaborado por el profesor Julio César Alonso Cifuentes, de la Facultad de Ciencias Administrativas y Económicas – Universidad Icesi. Contiene preguntas y respuestas

Alonso Cifuentes, Julio César

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Universidad Icesi  Departamento de Economía  Quiz #6 Chapter 8 and Maximum Likelihood Estimators   Group 3 Respuestas Sugeridas Econometría  06216 1. Una de las siguientes afirmaciones es incorrecta (escoja la mejor opción): a. Si se supone que ( )2~ 0, nIε σ  los estimadores de máxima verosimilitud (MV) para los betas son iguales a los estimador MCO.  b. El estimador de la varianza MV es insesgado. c. El estimador de la varianza MV difiere del estimador de la varianza por MCO. d. Para encontrar un estimador de MV es necesario conocer ( o suponer) la función de distribución de la que proviene la muestra.   Answer b  2. A dummy variable: a. Is also known as a binary variable, and it can take several values from 0 to 1. b. Is not called binary variable, and can take any value between -1 or 1.  c. Is not called as a binary variable, and it can not take just two values. d. None of the above Answer d   3. The purpose of a recent research project is to determine whether there exists a racial discrimination in salaries or not, in a given city. A sample of 20000 workers is used, where 5000 of the workers are black, 10000 are white and 5000 are Latin American workers. The following variables were used:  iS : is the salary of the worker i  iEx :  is the experience of the worker i iEdu : is the education level of the worker i 1      if the ith worker is white0     o.wiW=⎧⎨=⎩ 1      if the ith worker is black0     o.wiB=⎧⎨=⎩ 1      if the ith worker is Latin American 0     o.wiLA=⎧⎨=⎩ The following model was estimated: 0 1 2 3 4i i i iS Ex B LA Edui iβ β β β β= + + + + +εi One of the following sentences is not true, choose the appropriate  a. The model is appropriate to reach the objective of the research. b. If there is racial discrimination, the coefficients associated with   will not be significant. ,   and i iW B LAEconometría  jcalonso@icesi.edu.co  Sem01-2007  Universidad Icesi  Departamento de Economía  c. The expected sign of the coefficient associated to , if there’s discrimination in the salary against people that are not white, is negative and significant. iLAd. None of the above  Answer b   4. One of the following statements it’s not true: a. We can incorporate any qualitative characteristic into a regression with a dummy variable. b. The dummy variables are used to indicate the absence or presence of a particular quantitative characteristic.  c. The dummy variables are used to indicate the absence or presence of a particular qualitative characteristic. d. None of the above.  Answer b   5. One of the following models it’s the best to determine whether there exist any type of discrimination of gender in salaries or not. Suppose that :  is the experience of the worker i , : is the education level of the worker i, and:  iExiEdu1      if the ith worker is woman 0     o.wiW=⎧⎨=⎩ 1      if the ith worker is man 0     o.wiN=⎧⎨=⎩ a. 0 1 2 3 5i i i iS Ex W N Edu iβ β β β β= + + + + +εi i b. 0 1 2 3 5 6i i i i i i iS Ex W W Ex Edu EduWβ β β β β β= + + + + + +εi i c. 0 1 2 5 6i i i i iS Ex W Edu Edu Wβ β β β β= + + + + +εi i d. 0 1 2 5i i iS Ex N Eduβ β β β= + + + +ε   Answer b   Econometría  jcalonso@icesi.edu.co  Sem01-2007  

Quiz #6 Chapter 8 and Maximum Likelihood Estimators Group 3 Respuestas Sugeridas Econometría 06216

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Quiz #6 Chapter 8 and Maximum Likelihood Estimators Group 3 Respuestas Sugeridas Econometría 06216

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