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
ssec                    dataset of shanghai composite index
