寻求几本数理和计量教材的pdf版本，清晰度佳。
Gert Nieuwenhuis, Statistical Methods for Business and Economics, McGraw-Hill, 2009
Simon, C.P. and Blume, L., Mathematics for Economists, 1994
Stock, James H. and Mark W. Watson, Introduction to Econometrics, Pearson International Edition, 2007
Abadir, K., & Magnus, J. R., Matrix Algebra, Cambridge University Press, 2005
Manski, C., Analog Estimation Methods in Econometrics, Chapman & Hall , New York, 1988
Cameron, A. C., & Trivedi, P. K., Microeconometrics - methods and applications, only selected chapters. Cambridge University Press, 2005
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