This database is the best resource for economic indicators. It will also contain many statistics that you can use as independent variables.
Example #1: I want historical and forecasted GDP data and inflation rates for the United States.
At the top of the screen, click the link for Search Scroll down to the section for Economy and Finance and click the plus sign Click the box next to Annual rates of inflation Click the plus sign next to GDP Click the box next to Total GDP and also click the box next to Real GDP Growth Click the Now Choose Geographies icon at the bottom of the screen Click the plus sign next to North America and click the box for USA (many other nations can be selected) Click See Data Now Click Change Time Series and click By Year Click the boxes for 2000-2020 (or any other years that you need) and click Apply Click the Excel icon to download data
Presents economic statistics for 269 countries from the International Monetary Fund. Economic and financial data including interest rates, gross domestic product, exchange rates, international transactions, government accounts, international liquidity and international banking are available from 1948 to the present.
NBER Working Paper series - research findings from the National Bureau of Economic Research, a private non-profit engaged in quantitative analysis of the American economy; nearly 700 working papers are issued each year.