Appendix
Table 1: Summary Statistics
|
description |
count |
mean |
min |
max | |
|
agoa coefficient |
agoa coefficient reported in studies |
174 174 174 |
16.874 20.383 4.137 |
-11.92 0.000360 -7.579 |
769.5 1097.127 307.500 |
|
t statistic reported (if not, standarderror ) | |||||
|
Imputed T-stats from pvalues |
t-statistics calculated from inverse t-distribution |
25 |
-0.523 |
-1.656 |
2.333 |
|
no. of countries |
number of countries in study |
174 |
66.126 |
1 |
207 |
|
no. of years |
number of years of data |
174 |
11.989 |
1 |
18 |
|
no. of explanatory variables |
number of explanatory variables (excluding |
174 |
11.161 |
2 |
37 |
|
N |
sample size |
174 |
3.27e+05 |
92 |
9.54e+06 |
|
annual = 1 |
dummy if data is annual |
174 |
0.839 |
0 |
1 |
|
selection correction = 1 |
dummy if selection correction was used |
174 |
0.034 |
0 |
1 |
|
published = 1 |
dummy for published studies |
174 |
0.494 |
0 |
1 |
|
country effects = 1 |
dummy if regression includes country effects |
174 |
0.695 |
0 |
1 |
|
time effects = 1 |
dummy if regression includes time effects |
174 |
0.621 |
0 |
1 |
|
cross section = 1 |
dummy if data is a cross-section |
174 |
0.029 |
0 |
1 |
|
other preferences included = 1 |
dummy if regression includes other preferences |
174 |
0.437 |
0 |
1 |
|
gravity regression = 1 |
dummy if gravity regression is used |
174 |
0.511 |
0 |
1 |
|
agoa dummy = 1 |
dummy if agoa is defined as a 0,1 dummy |
174 |
0.977 |
0 |
1 |
|
robust s.e. = 1 |
dummy if White’s heteroscedastic-consistent standard are used |
174 |
0.431 |
0 |
1 |
|
product effects = 1 |
dummy if product effects are included in the regression |
174 |
0.161 |
0 |
1 |
|
single country analysis = 1 |
dummy if data is on a single country |
174 |
0.057 |
0 |
1 |
|
logged dep. var. = 1 |
dummy if dependent variables is in logs |
174 |
0.868 |
0 |
1 |
|
product group = ”All/Total” |
dummy for total/all products |
174 |
0.408 |
0 |
1 |
|
product group = ”Apparel & Textiles” |
dummy for apparel and textile products in regression |
174 |
0.092 |
0 |
1 |
|
product group = ”Agriculture” |
dummy for agriculture |
174 |
0.167 |
0 |
1 |
|
regions included = AGOA countries |
dummy if only agoa countries are used in regression |
174 |
0.552 |
0 |
1 |
|
regions included = AGOA + N. Africa |
dummy if Africa is used in the regression |
174 |
0.126 |
0 |
1 |
|
definition of dep. var. = Exports |
dummy if exports are used as dependent variable |
174 |
0.489 |
0 |
1 |
|
definition of dep. var. = Imports |
dummy if imports are used as dependent variable |
174 |
0.477 |
0 |
1 |
|
time frequency = Annual |
dummy if data is annual |
174 |
0.839 |
0 |
1 |
|
time frequency = Monthly |
dummy if data is monthly |
174 |
0.057 |
0 |
1 |
|
econometric method = GMM |
dummy if a GMM approach is used |
d 174 |
0.213 |
0 |
1 |
|
econometric method = Heckman/Tobit |
dummy if Heckman/Tobit model is used |
174 |
0.287 |
0 |
1 |
|
reference category is other |
dummy if dependent variable is aggregated |
174 |
0.609 |
0 |
1 |
|
level of aggregation = Less Aggregate |
dummy if dependent variable is less aggregated |
174 |
0.184 |
0 |
1 |
|
start year of data |
dummy for initial year of data |
174 |
1994.483 |
1991 |
2001 |
|
end year of data |
dummy for final year of data |
174 |
2005.489 |
2001 |
2009 |
|
Observations |
_ |
174 | |||
20