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



Table 2: Random effects meta-regression results

(1)

T-stat

(2)

T-stat

(3)

T-stat

precision

0.00443

4.276

0.366

(0.009)

(3.055)

(0.687)

no. of explanatory variables

0.0417***

0.0416***

(0.001)

(0.001)

N (in logs)

-0.00369

-0.000990

(0.016)

(0.015)

no. of years (logs)

-0.289

-0.702

(1.056)

(0.444)

no. of countries (logs)

-0.0613*

-0.0552*

(0.028)

(0.026)

annual = 1

-4.897

1.614**

(3.858)

(0.510)

published = 1

2.326

0.00784

(3.427)

(0.023)

country effects = 1

2.493*

-0.0776

(1.145)

(0.308)

time effects = 1

0.0140

-0.0267

(0.135)

(0.124)

cross section = 1

1.311

-2.309**

(17.103)

(0.864)

other preferences included = 1

-0.290

0.110

(15.539)

(0.163)

gravity regression = 1

8.338+

-0.583**

(4.250)

(0.178)

robust s.e. = 1

-0.143**

-0.160***

(0.046)

(0.043)

product effects = 1

-2.893*

0.0964

(1.193)

(0.125)

logged dep. var. = 1

-0.211

0.244*

(0.590)

(0.111)

product group = ”All/Total”

-0.0560

(0.191)

product group = ”Apparel & Textiles”

-0.0584

(0.128)

product group = ”Agriculture”

0.0650

(0.074)

regions included = AGOA countries

-3.870

(15.307)

regions included = AGOA + N. Africa

-8.448

(7.026)

definition of dep. var. = Exports

-0.277

(15.264)

definition of dep. var. = Imports

2.871

(15.228)

time frequency = Monthly

-5.060

(3.842)

econometric method = GMM

-2.620*

(1.319)

econometric method = Heckman/Tobit

-8.678**

(2.952)

level of aggregation = Aggregate

0.0950

(0.113)

level of aggregation = Less Aggregate

-2.223

(3.424)

single country analysis

1.015**

(0.336)

Constant

2.769

-0.707*

-0.392

(2.135)

(0.356)

(0.313)

Observations

τ 2 = 0 constant only model

τ 2 estimate

LR test of τ 2 = 0

degrees of freedom

173

730.5

733.9

1.31107e+10

171

173
6550.9
7.923

150

173

730.5

7.215

320466.4

156

Standard errors in parentheses, All explanatory variables are divided by the standard error
+ p < 0.1, * p < 0.05, ** p < 0.01, ∙∙, p < 0.001

12



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