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| ed_code | code list by category |
| ed_fred | query FRED economic data |
| ed_fred_symbol | symbol of FRED economic data |
| ed_nbs | query NBS economic data |
| ed_nbs_subregion | subregion code of NBS economic data |
| ed_nbs_symbol | symbol of NBS economic data |
| md_cate | query main market data by category |
| md_future | query future market data |
| md_future_symbol | symbol of future market data |
| md_stock | query stock market data |
| md_stock_adjust | adjust stock price for split and dividend |
| md_stock_financials | query financial statements |
| md_stock_symbol | symbol components of exchange or index |
| pq_addti | adding technical indicators |
| pq_index | creating weighted index |
| pq_perf | creating performance trends |
| pq_plot | creating charts for time series |
| pq_return | calculating returns by frequency |
| pq_to_freq | converting frequency of daily data |