%x>%                    crossover operators
dt_banks                dataset of bank stocks in sse
dt_ssec                 dataset of shanghai composite index
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_bond                 query bond data
md_forex                query forex data
md_future               query future market data
md_future_symbol        symbol of future market data
md_money                query interbank offered rate
md_moneycn              query chinese benchmark rates
md_stock                query stock market data
md_stock_adjust         adjust stock prices
md_stock_financials     query financial statements
md_stock_symbol         symbol components of exchange
md_symbol               symbol of market data
pq_addti                adding technical indicators
pq_addti_funs           technical functions
pq_freq                 converting frequency of daily data
pq_opr                  dataframe operation
pq_performance          calculating performance metrics
pq_performance_funs     performance functions
pq_plot                 creating charts for time series
pq_portfolio            calculating returns/equity of portfolio
pq_return               calculating returns by frequency
