Information Needed 
 Groups 
Aggregated information should be calculated in following groups:
-  date range
 -  side: buy, sell, short
 -  trading strategy: vwap, market participation, impl shortfall, etc.
 -  region
 -  currency
 -  market
 -  client
 -  size of orders: quantity / ADV
 -  Market Capitalization of names: (can refer to Barra's data)
-  Large: > $10B
 -  Mid: $2B ~ $10B
 -  Small: $300M ~ $2B
 -  Micro: < $300M
 
 -  all orders
 
ADV:
Average Daily Volume. It can be calculated as the n-day average daily volume, or n-day median daily volume.
 Order Summary Information needed 
We need following information for analysis:
-  basic information:
-  side
 -  number of parent orders
 -  quantity
 -  executed quantity
 -  notional executed value: sum(execPrice * execQty)
 -  bench mark: daily vwap, timed vwap, or arrival price, etc.
 
 -  performance:
-  average of returns
 -  standard deviation of returns
 
 -  top n best/worst performers