Hello Statalist

1). Can I run a gmm, 2sls, ols estimations using this (partial snapshot shown below) very unbalanced dataset?
2). The impute/interpolate solutions do not apply here as data does not change by fixed increments per year, correct?
3). Any ideas on alternative data sources for balanced panel? The variables are;
  • Poverty variables:Gini, poverty headcount ratio, Income share by quintiles, and,
  • Financial development variables: Private Credit, Banks/100k people, ATM/100k people, stock market data-traded, valuation, turnover, and,
  • Controls: inflation, secondary attainment, per capita GDP, trade openness, gov expenditure
Number of countires, N: 54 (African)
Period, T: 20
Source:World Bank (World Dev Indicators)