a robustness check of our estimates. However, with multi-level modelling a good number of studies need to
be used since the estimator has asymptotic properties. Possibly, in the near future there would be a lot more
econometric studies on agoa to help resolve these issues by providing a larger sample of studies.
References
Armitage, P., and T. Colton, (Eds.) Encyclopaedia of Biostatistics, Wiley. 1998
Borenstein, Michael, Larry V. Hedges, Julian P. T. Higgins, and Hannah R. Rothstein. Introduction to Meta-
Analysis. UK: John Wiley and Sons Ltd. 2009.
Cipollina, Maria, and Luca Salvatici, Reciprocal Trade Agreements in Gravity Models: A Meta-Analysis
Review of International Economics, 18(1), 63-80, 2010.
Collier, Paul, and Anthony J Venables, Rethinking Trade Preferences: How Africa Can Diversify its Ex-
ports, World Economy, 30(8), 2007, doi: 10.1111/j.1467-9701.2007.01042.x
Condon N., and M. Stern, The effectiveness of African Growth and Opportunity Act (AGOA) in increas-
ing trade from Least Developed Countries: a systematic review. London: EPPI-Centre, Social Science
Research Unit, Institute of Education, University of London, 2011.
Doucouliagos, Chris, Publication bias in the economic freedom and economic growth literature. Journal of
Economic Surveys Vol. 19, No. 3, 2005
Doucouliagos, Hristos and T.D. Stanley, Publication Selection Bias in Minimum-Wage Research? A Meta-
Regression Analysis. Deakin Economiccs Series SWP 2008/14, 2008
Egger, M., G. Davey Smith, M. Schneider, and C. Minder, Bias in meta-analysis detected by a simple,
graphical test. British Medical Journal 315: 629-634, 1997.
Goldstein, Harvey, Multi-level Model in Armitage, P., and Colton, T. (Eds.) Encyclopaedia of Biostatistics,
Wiley. 1998
Feld, L.P. and J.H. Heckemeyer, FDI and taxation: a meta-study. Journal of Economic Surveys, 25(2),
pp.233-272, 2011.
Konstantopoulos, Spyros, Fixed Effects and Variance Components Estimation in Three-Level Meta-
Analysis, Discussion Paper No. 5678, April 2011
Rose, Andrew K. and T. D. Stanley, A meta-analysis of the effect of common currencies on international
trade. Journal of Economic Surveys Vol. 19, No. 3, 2005.
Stanley, T.D., Beyond publication bias. Journal of Economic Surveys 19, (2005), 309-345.
Stanley, T.D., Meta-Regression Methods for Detecting and Estimating Empirical Effects in the Presence of
Publication Selection. Oxford Bulletin of Economics and Statistics, 70, 1 (2008). doi: 10.1111/j.1468-
0084.2007.00487.x.
Stanley, T. D. and Hristos Doucouliagos, Picture this: a simple graph that reveals much ado about research.
Journal of Economic Surveys (2010) Vol. 24, No. 1, pp. 170191. doi: 10.1111/j.1467-6419.2009.00593.x
Stanley T.D., Chris Doucouliagos, and Stephen B. Jarrell, Meta-regression analysis as the socio-economics
of economics research, The Journal of Socio-Economics 37, (2008), 276-292
17