GRTC (in %)

GRTD (in %)

GRTR (in %)

${\widehat{\beta }}_1$ (in %)

t-value for ${\beta }_1$

Bangladesh

0.9074

0.7733

1.0698

1.7713

318.583*

Africa

1.1256

0.8395

1.7555

2.4468

288.181*

Asia

0.9655

0.8392

1.5678

1.4041

335.602*

East Asia

0.6340

0.4133

0.8415

0.8475

73.2671*

South Asia

1.4763

0.9262

2.3931

1.3560

312.175*

South East Asia

1.2675

1.1736

1.8960

1.9786

421.537*

Europe

1.1810

0.7639

1.6833

1.5490

92.659*

European Union

1.1777

0.6943

1.5859

1.4200

73.748*

North America

1.2345

0.6002

1.5590

1.7500

123.752*

South America

1.0301

0.8660

1.3337

2.9092

226.793*

Oceania

0.9727

0.6850

1.1072

0.2318

34.4527*

World

0.9823

0.8338

1.1332

1.7640

150.555*