Appendix A: Global Corruption Barometer survey methodology For the Global Corruption Barometer, approximately 1,000 people from each of 107 countries were surveyed between September 2012 and March 2013. Five hundred people were surveyed in countries with a population of less than 1,000,000 (see table below). The survey sample in each country has been weighted to be nationally representative where possible. In six countries, the sample was urban only. The survey questionnaire was translated into local languages and used for face to face, CATI (Computer Assisted
Telephone Interviewing) or online interviews depending on the country context. The data has been checked and analysed at the Transparency International Secretariat in Berlin and verified by an independent analyst. The results presented in the report do not include ambiguous responses (don’t know/no answer). Global results are the un-weighted average across the 107 countries surveyed and any apparent small difference in the aggregated global results is due to rounding differences. The full results at individual respondent level are available free of charge on request from Transparency International.
COUNTRY/territory
COMPANY
SAMPLE
METHOD
COVERAGE
Afghanistan
Ascor
2040
Face to face
National
Albania
BBSS
999
Face to face
National
Algeria
BJ Consult
1000
Face to face
National
Argentina
Ibope
1001
CATI
National
Armenia
MPG LLC
1068
Face to face
National
Australia
Colmar Brunton
1206
Online
National
Azerbaijan
SIAR
1001
CATI
National
Bangladesh
TI-Bangladesh
1822
Face to faceÂ
National
Belgium
iVox
1000
Online
National
Bolivia
Ibope
1000
Face to face
National
Bosnia and Herzegovina
Mareco Index Bosnia
2000
Face to face
National
Brazil
Ibope
2002
Face to face
National
Bulgaria
BBSS
1002
Face to face
National
Burundi
Infinite Insight
1000
Face to face
National
Cambodia
Indochina Research
1000
Face to face
National
Cameroon
RMS Africa
1055
Face to face
National
Canada
Leger Marketing
1000
Online
National
Chile
Ibope
1000
CATI
Urban
Colombia
Sigma Dos
1001
Face to face
National
Croatia
BBSS
1000
Face to face
National
Cyprus
TI-Cyprus
570
Online
National
Czech Republic
Mareco
1000
Face to face
National
1062
Face to face
Urban
Democratic Republic of RMS Africa the Congo
Global Corruption Barometer 2013
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