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© comScore, Inc. Proprietary. Presentation to W3C on Audience Measurement Josh Chasin; Chief Research Officer| May 6, 2013
© comScore, Inc. Proprietary. 2 Agenda Placing audience measurement in a historical context How audience measurement integrates census data (tags and cookies) into reported data
© comScore, Inc. Proprietary. 3 Historical Context Media vehicle audiences are not, a priori, known How many people watched the TV broadcast? How many people listened to the radio station? How many people actually read this months issue? How many people passed by the billboard? The business of media, generally dependent on advertising, requires some consensus third party measure of audience size and composition, in order for that advertising to be bought and sold Audience measurement emerged to fill this need First, based on surveys Over time, incorporating technology (i.e., TV meters) Ultimately incorporating what the industry calls naturally occurring data (e.g. TV STB data)
© comScore, Inc. Proprietary. 4 Audience measurement neither supports nor leads to cookie targeting In fact, cookie targeting circumvents audience measurement entirely Audience Measurement versus Cookie Targeting
© comScore, Inc. Proprietary. Integrating Panel Data and Census Data Strategy 1: Calibration
© comScore, Inc. Proprietary. 6 How Does Weighting Work? Illustration: Sample Composition versus Universe
© comScore, Inc. Proprietary. 7 How Does Weighting Work? Each person in the panel represents a number of people in the universe. If the Universe is 10 million, and the panel is 10,000 people, then (without weighting) each person represents (10 million / 10,000), or 1,000 people Note: the size of the universe is typically ascertained through surveys But the market requires that the panel is weighted to reflect the universe for age and gender (so as not to penalize or benefit unfairly media vehicles with specific age or gender skews) We saw that 15% of the panel was male 18-34, versus 18% of the Universe Basically, weighting for demographics means we need to weight up the sample Males 18-34 by (18/15, or 1.2) So we apply a weight of 1.2 to each male 18-34 panelist, and now instead of having them each represent 1,000 people, they each are weighted to represent 1200 people After weighting, male 18-34 panelists will collectively carry 18% of the weight, matching universe
© comScore, Inc. Proprietary. 8 Calibration of a panel to cookie and beacon data works in a similar fashion.
© comScore, Inc. Proprietary. 9 Panel-Only Page Views Versus Census Beacon Hits
© comScore, Inc. Proprietary. 10 We know empirically how many census beacon hits (analogous to Page Views) were generated at sites A, B, C, and D We can thus weight the panelists such that after weighting, the panel projections for Page Views match the known counts for census beacon hits Calibrating the Panel to Census Digital Data
© comScore, Inc. Proprietary. 11 CALIBRATED Panel-Only Page Views Versus Census Beacon Hits
© comScore, Inc. Proprietary. Integrating Panel Data and Census Data Strategy 2: Hybrid Integration
© comScore, Inc. Proprietary. 13 Imagine my surprise when I came to the IAB and discovered that the main audience measurement companies are still relying on panels, a media- measurement technique invented for the radio industry exactly seven decades ago, to quantify the Internet. --Randall Rothenberg; CEO, US IAB; Open letter to comScore and Nielsen, April 20, 2007 The Industry Has Demanded That Audience Measurement Companies Integrate Site-Centric Data Into the Audience Measurement Process
© comScore, Inc. Proprietary. 14 But site-centric audience measurement is cookie-based, and audiences are comprised of persons
© comScore, Inc. Proprietary. 15 Integration of Cookie Data and Panel Data to Size Website Audiences Given a publisher tags content for the measurement company (lets call that company, comScore) Step 1: Count comScore census cookies observed at that site in a month Allocate by country (that is, in creating the US audience, limit analysis to US cookies only) Eliminate bots, spiders etc. (known IAB lists, plus active filtration) Net result: in-country filtered cookies (lets call it, 3 million cookies) Step 2: Observe cookies per person from the panel Among panelists, research company can see cookie behavior Develop a panel-based cookies-per-person metric (lets call this 1.5) Step 3: Reported audience is (census filtered cookies) / (Cookies per person) In this case, 3 million / 1.5 = 2 million persons
© comScore, Inc. Proprietary. 16 Demographics come entirely from the panel Suppose the panel (post-weighting and calibration, if applicable) tells us that 20% of the sites audience is female 25- 54 Apply the % composition from the panel (20%) to the sites total projected audience (2 million, previous slide), or 400,000 women 25-54 So Where Do Demographics Come From?
© comScore, Inc. Proprietary. 17 1.We dont use, or even attempt to know, anything about the persons behind these cookies 2.All we are doing is counting the cookies 3.We do not believe that counting is tracking A Few Points
© comScore, Inc. Proprietary. www.comscore.com www.facebook.com/comscoreinc @comScore Questions & Conversation
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