1. A computer-implemented method for facilitating analysis of consumer behavior in association with advertising exposure or program delivery, the method comprising: collecting in an advertising measurement system: (i) clickstream data from a program delivery source of a consumer, wherein collecting the clickstream data is not dependent on a supplemental data collection device, and also wherein the collected clickstream data includes household data; (ii) advertising data associated with delivery of the program by the program delivery source, wherein collecting the advertising data is not dependent on a supplemental data collection device, and also wherein the collected advertising data includes household level data associated with multiple consumer households; (iii) programming data associated with the program delivered on the program delivery source, wherein collecting the programming data is not dependent on a supplemental data collection device, and also wherein the collected programming data includes household level data associated with multiple consumer households; and, (iv) purchase data from a purchase data source, wherein collecting the purchase data is not dependent on a supplemental data collection device, and also wherein the collected purchase data includes household data; matching at least portions of the collected advertising data, the collected clickstream data, the collected purchase data, and the collected program data in the advertising measurement system at a household data level with at least one electronic computer processor configured for processing data received from the program delivery source, the advertising data source, the programming data source, and the purchase data source, wherein the matching further includes: (i) grouping the collected data in association with an identifier of each consumer household without processing any personally identifiable information associated with the consumer household, and (ii) matching each identifier associated with each consumer household with other identifiers associated with the same consumer household without processing any personally identifiable information associated with the consumer household; storing the matched advertising data, clickstream data, purchase data, and programming data in at least one electronic data storage medium operatively associated with the computer processor; applying at least one cleansing algorithm or editing algorithm to the collected data, the matched data or the stored data; and, calculating at least one return on investment metric or true target index metric based on the collected data, the matched data or the stored data.