Cesar Calderon, Enrique Moral-Benito, and Luis Serven, "Is
Infrastructure Capital Productive? A Dynamic Heterogeneous Approach",
Journal of Applied Econometrics, Vol. 30, No. 2, 2015, pp. 177-198.

All data are in the text file data-cmbs.txt, which is an ASCII file in
DOS format. It is zipped in the file data-cmbs.zip Unix/Linux users
should use "unzip -a".

The data consist of 3,977 observations (rows). There are 15 variables
(columns). 

The table below lists the names of the variables included in the
dataset and a short description (more details can be found in Section
2 of the paper):

--------------------------------------------------------------------------
variable name      description
--------------------------------------------------------------------------

year		YEAR
cid		COUNTRY IDENTIFIER (NUMBER)
code		COUNTRY IDENTIFIER (TEXT)
country		COUNTRY NAME	
y		GDP
k		PHYSICAL CAPITAL
kbc30		PHYSICAL CAPITAL (BC)
lwdi		LABOR
secondary	YEARS OF SECONDARY EDUCATION	
egc		ELECTRICITY GENERATING CAPACITY
mlines		MAIN PHONE LINES
troads		TOTAL ROADS	
cells		CELL PHONES
proads		PAVED ROADS
rails    	RAILS

-------------------------------------------------------------------------