Variable

Coefficient

Standard error

t-statistic

Probability

Overall Sample of EA.

lnID

0.075871***

0.009805

7.737817

0.0000

lnICT

0.226311***

0.051869

4.363102

0.0000

Diagnostic checking

R-squared

0.849596

Adj. R-squared

0.837234

LM = 3.6381 (0.5731); RESET = 2.7382 (0.4391); WHET = 4.7261 (0.4829)

Lower Middle-Income Countries (LMIC)

lnID

0.052287**

0.021941

2.383118

0.0175

lnICT

0.119045***

0.037490

3.175371

0.0010

Diagnostic checking

R-squared

0.815159

Adj. R-squared

0.750373

LM = 3.4382 (0.2510); RESET = 3.4261 (0.6372); WHET = 4.5229 (0.4739)

Low-Income Countries (LIC)

lnID

0.041248**

0.018364

2.246184

0.0251

lnICT

0.060473***

0.021548

2.806394

0.0052

Diagnostic checking

R-squared

0.821889

Adj. R-squared

0.706783

LM = 3.2991 (0.3829); RESET = 4.6320 (0.3922); WHET = 3.5362 (0.2839)