What is a statistical indicator?

A statistical indicator is the representation of statistical data for a specified time, place or any other relevant characteristic, corrected for at least one dimension (usually size) so as to allow for meaningful comparisons. (definition from this glossary).

Statistical indicators allow us to compare countries by certain characteristics.

I would like to understand what characteristics of Vietnam make it good for an online English class, and what other countries are similar to Vietnam in those ways. That would help to know where to advertise the group.

Consider these: internet access is needed for this class. Vietnam has fast internet and many people use smartphones. What other countries have fast internet? Among the countries in the lower-middle income group, which one has the highest number of internet users? Nepal.

economy & growth

personal remittances received
GDP
GDP per capita (current USD)
GDP growth
gross domestic income
exports of goods and services (% of GDP)
Foreign direct investment, net inflows (% of GDP)
Service exports
Imports/exports of goods and services
textiles and clothing (% of value added in manufacturing)
Travel services (% of service imports)
Annualized average growth rate in per capita survey mean consumption or income
survey mean consumption or income per capita, bottom 40% of pop.

ease of doing business rank
international tourism, expenditures
GDP per person employed

demographics

population ages 0-14 (% of population)
population growth (annual %)
Labor force, total
age-dependency ratio
employment in agriculture
Urban population
population density

Infrastructure

Mobile cellular subscriptions (per 100 people)
Communications, computer etc. (% of service imports, BoP)

education

Government expenditure on education, total (% of government expenditure)
compulsory education duration
current education expenditure, total (% of total expenditure in public institutions).
Educational attainment – at least bachelors
government expenditure on education
government expenditure per student, tertiary
labor force, female (% of total labor force)
pupil-teacher ratio
school enrollment

Energy

access to electricity, urban, rural
energy use

Poverty

Survey mean consumption or income per capita, bottom 40% of population (2017 PPP $ per day).
Current account balance
Gross domestic income
personal remittances (received)
Income share held by highest 10%

Health

Birth rate, crude (per 1,000 people)
fertility rate, total
population ages 0-14