These are some macroeconomic data for 21 select (rich) countries. I've used these data before to discuss issues of grouping and skew in cross-sectional data.
pwt_sample
A data frame with 1428 observations on the following 7 variables.
country
the country name
isocode
The country's ISO code
year
a numeric vector for the year
pop
Population in millions
hc
Index of human capital per person, based on years of schooling and returns to education
rgdpna
Real GDP at constant 2011 national prices (in million 2011 USD)
labsh
Share of labor compensation in GDP at current national prices