1. A method comprising: determining a first instance in which a first request is received by an exchange; determining a second instance in which a second request is received by the exchange, in which the second request defines a request to cancel the first request; determining a third instance in which a third request is received by the exchange, in which the third request corresponds to the first request; calculating a first difference between the second instance and the third instances; storing the first difference to a data storage, in which the data storage comprises a plurality of differences; and analyzing the plurality of differences to generate comparative information.