Systems and techniques to generate statistical reports on transactions
conducted via an electronic marketplace are based on data extracted from
the transaction documents. In general, in one implementation, the
technique includes receiving documents sent through an electronic
marketplace, and extracting data from the documents. The extracted data
may relate to a predetermined statistical category of transactions
conducted through the electronic marketplace. The extracted data may be
stored for each document, and the stored data may be aggregated according
to the predetermined statistical category. In some implementations, a
report may be generated that relates to a document flow analysis for
documents sent through the marketplace according to the buyer, seller,
time period, document type, and/or other parameters.