Why shouldn't I just use free data for all my needs?
Free data on Quandl, while good, has certain known limitations:
- Coverage. Certain data feeds are simply not available anywhere for free.
- Quality. Transparent and accurate reproduction cannot fix errors in the underlying data. If a source publishes incorrect or incomplete data, there's nothing we can do.
- Documentation. Public data is not always coherently structured or clearly documented.
- Timeliness. Data sources often publish their data with a lag.
If you need high-quality, well-documented, timely data for professional purposes, we recommend using premium data feeds instead.