A data frame that contains data for individual commodities.
sector.selected
The sector that the function is doing summarization
for. When "sector.selected = NULL", the function performs summarization across
the whole data set.
capital.num
The constant number of allocated capital to calculate return,
number. Default value is NULL. When "capital.num = NULL", the function uses
gross market value to calculate return rates for each row.
Value
A data frame that summarizes the market values and returns across all
commodities.