Econometrics (economic measure) can be defined as a social science in which economic and mathematical knowledge are co-present in the analysis of economic phenomena. Knowledge already taught in secondary mathematics education must be transformed into tools for modeling phenomena of economic in reality. In this paper, we are going to explain the difficulties of students when they have to mobilize the two objects of knowledge: The slope of the straight line and the logarithms. | VNU Journal of Science: Education Research, Vol. 31, No. 4 (2015) 26-35 Secondary Mathematics Knowledge in Econometrics Lê Thái Bảo Thiên Trung* Mathematics and Informatics Faculty, Hồ Chí Minh City University of Education Received 02 October 2015 Revised 26 November 2015; Accepted 22 December 2015 Abstract: Econometrics (economic measure) can be defined as a social science in which economic and mathematical knowledge are co-present in the analysis of economic phenomena. Knowledge already taught in secondary mathematics education must be transformed into tools for modeling phenomena of economic in reality. In this paper, we are going to explain the difficulties of students when they have to mobilize the two objects of knowledge: the slope of the straight line and the logarithms. Keywords: Mathematics knowledge in secondary education, slope of the straight line, logarithm, econometrics. 1. Secondary mathematics knowledge in econometrics * Almost the students from classes we observed could not answer this question. - Note 2 : Let y = ax β (Model 1) In this paper, we just mention two objects of knowledge: When the lecturer aksed this question: - Linear function y = ax + b How do we change Model 1 – a nonlinear model to a linear model as the following form y* = ax * +b ? - Concept of logarithm These two objects of knowledge are researched from observing students’ difficulties when we teach econometrics in the bachelor of economics training program. None of the students had any idea about using logarithm for this case. The following presentation might explain for the difficulties of students when they mobilize the two mentioned objects of knowledge. On the other hand, we will clarify some roles of each one. - Note 1: Let y = 24,25 + 0,78x, where x is the income and y is the expenditure. When the lecturer raised this question: If the income is increased a unit of currency, how will the expenditure change? 2. Role of the straight line and its .
