American trade policy towards Sub Saharan Africa –- a meta analysis of AGOA



Table 3a: Meta analysis by Study and overall effect

Study

ES

95% Conf.

Interval

% Weight

Seyoum(2007)
Sub-total

D+L pooled ES

-0.054

-0.276

0.168

6.34

Giovannetti and Sanfilippo (2009)
Sub-total

D+L pooled ES

0.003

0.002

0.004

18.05

Nouve (2005)
Sub-total

D+L pooled ES

0.171

0.155

0.187

15.78

Collier and Venables (2007)
Sub-total

D+L pooled ES

1.486

-0.359

3.331

0.07

Lederman and Ozden (2007)
Sub-total

D+L pooled ES

1.093

-0.324

2.509

1.8

Nouve and Staatz (2003)

Sub-total

D+L pooled ES

-0.059

-0.092

-0.027

12.8

Frazer and Van Biesebreock (2010)
Sub-total

D+L pooled ES

0.037

-0.383

0.456

0.62

Cooke (2011)

Sub-total

D+L pooled ES

0.483

0.256

0.711

17.99

Cooke(2009)

Sub-total

D+L pooled ES

-0.039

-0.088

0.01

16.17

Tadesse and Fayissa (2008)

Sub-total

D+L pooled ES

0.047

-0.033

0.127

7.93

Tadesse, et al (2008)

Sub-total

D+L pooled ES

0.005

-0.011

0.021

2.45

Overall

D+L pooled ES

0.124

0.075

0.173

100

Heterogeneity calculated by formula

Q = σi VaarincLCiei') × (effecti - effectpooled)2
where, variancei = ( upper limit-lower limit V
,               i                      2×z

22



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