SWEDISH PODCAST MEASUREMENT STANDARDS
The Swedish Podcast Measurement Standard is created by a working group including Kantar, Sveriges Annonsörer, Sveriges Radio, Acast, Bauer Media, Nordic Entertainment Group and Podspace.
The purpose of this standardization is to introduce transparent and consistent podcast audience metrics across podcasts, platforms, publishers and service providers. The standardization offers all podcast stakeholders a defined set of metrics making it possible to track listening consistently over time and to equally compare podcasts and podcast networks.
The standardized methodology is implemented by the group's members in the technical committee and audited by the third-party Kantar Media Audit.
The Swedish Podcast Measurement Standards are harmonizing metrics with IAB Podcast Measurement Technical Guidelines 2.0.
The methodology includes two metrics making it possible to evaluate audience reach and activity across podcasts, platforms and publishers. All filters applying to Listens/Downloads also apply to Reach/Listeners.
The group is in contact with podcast standardization initiatives globally, mainly IAB Tech Lab (US) through IAB Sweden. Technology is in constant development and digital distribution is global, thus the Swedish working group has all intentions to participate globally and if needed adjust these standards over time.
Mattias Björkman - Bauer Media, Chairman of this committee
Fredrik Hermansson - Acast
Robin Calmegård - Nent
Anna Johansson - Sveriges Radio
Edward Jewson - Podspace / Bowtie
Karolina Roslund - Perfect Day Media
Peter Mackhé - Sveriges Annonsörer
Maria Grip - Kantar
Lars Björkman - Kantar
Measurement Standard versions
Version 1 was released 2017-11-15 when Poddindex.se was launched.
Version 2 was released 2018-01-17, in which clarification regarding all filters applying Listens also apply Reach was added. As well as change in duration filtering from 10 sec to 60 seconds harmonizing Reach metric with IAB Podcast Measurement Technical Guideliness 2.0.
For the purpose of this paper Podcast is defined as all editorial audio content that can be consumed On Demand, including audio productions that have been distributed via radio as well as productions exclusively distributed On Demand.
How Listeners Access Podcasts
Podcasts are accessed through a wide range of applications, websites and devices, in this paper called ‘clients’. These clients distribute podcasts directly or through RSS feeds. The RSS protocol makes it possible for a client to subscribe on a podcast updating and consuming it from publishers without further technical integration.
This has led to superior accessibility where publishers can distribute podcasts through a range of platforms, not limited to proprietary clients. As a result Apple Podcaster is the biggest client for podcasts listening in Sweden, pre installed in all iPhones with most podcasts and publishers represented. Listening is however fragmented on various websites, applications and digital appliances, including proprietary publisher platforms such as Sveriges Radio Play (SR), Acast (Acast), Podplay (Bauer Media) and I Like Radio (Nent).
The most common form of accessing a podcast in Sweden is downloading the file during listening. This is called progressive download, and in daily speech streaming. In strict technical terms it’s not true streaming since the connection to the server is not necessarily persistent, but most clients do use progressive download instead of true streaming since it provides the best user experience balancing fast and stable playback.
Server Side Measurement
The fragmented distribution across multiple clients has led to the development of new measurement technologies where both audience and ad serving is measured through servers streaming the podcast rather than clients consuming it. Server side technology has huge advantages in cross platform measurement and monetization but poses new challenges when it comes to data quality.
Like all digital measurements there is always a risk that content or ads can be requested by non-human traffic. Counting the number of raw requests to the server could thus generate far higher numbers than actual requests made by true listeners. It can easily overstate delivery by a factor of 4x or more. This can be solved using filters making sure traffic is as human as possible.
Poddindex includes two metrics, reach and listens, making it possible to evaluate audience reach and activity across podcasts, platforms and publishers. All filters applying to Listens also apply to Reach. Poddindex urges service providers to apply filtering as stated in the IAB Podcast Measurement Technical Guidelines Version 2.0 to produce these metrics.
A detailed technical specification on guideline implementation by each service provider is documented in section Appendix 1 of this paper.
Reach / "IAB Listeners":
The measurement of uniqueness is important to all stakeholders in order to know the reach of a given podcast or set of podcasts. It’s also a prerequisite for frequency measurement and filtering. It consists of data that represents a unique identifier who downloads content (for immediate or delayed consumption). Podcast consumption takes place on a variety of platforms and the method for identifying uniqueness can be adapted depending on the platform. In general, it is calculated as a unique combination of IP-address and User Agent, but cookies, device id and user id can be used as well.
At Poddindex reach is stated in the timeframe of a week and across all podcast episodes. The reach of a service provider is stated as unique identifiers across all episodes and podcasts within that service provider (i.e. not cumulated podcast reach).
The reach metric is called Räckvidd/"IAB Listeners" on Poddindex, and “Listeners” in IAB guidelines. Full technical specification on IAB guidelines is found here.
Listens / "IAB Downloads":
In combination with reach we need to measure the activity by each unique identifier. For example, the frequency in which each unique consume a podcast. It consists of a unique file request that was downloaded over 60 seconds of audio (for immediate or delayed consumption). To ensure relevant traffic a frequency filter is applied to listens where only one listen per unique, episode and day is included. Listens are higher than reach since one unique identifier can start several episodes on any given day, or the same episode on different days.
At Poddindex listens are stated in the timeframe of a week and across all podcast episodes. The listens of a service provider is stated as the total amount of listens across all episodes and podcasts within that service provider.
The listen metric is called "Lyssningar / "IAB Downloads" on Poddindex, and “Downloads” in IAB guidelines. Full technical specification on IAB guidelines is found here.
3. Sample Audit
In order to achieve higher transparency and quality assurance, a sample audit model is implemented for Poddindex-connected service providers ("Plattform").
The standardized methodology described in this paper is based on server data and thus integrated with podcast distribution. Podcast platforms and publishers use different systems for distribution which means that there might be slight variations in how the methodology is implemented between service providers.
The very purpose of the standardization is to introduce transparent and consistent podcast audience metrics. Therefore, each certified service provider specifies what system is being used and how the standardization is implemented, see appendix 1.
Each system is audited by Kantar Media Audit to assure aligning results between audit and what is published on Poddindex.se. The audit concept is called Sample Audit since it is based on random sampling of log files, provided to Kantar Media Audit by the service providers.
Process of audit
The service providers deliver server logs according to established requirements specification, aggregated compiled per week, to Kantar Sifo AB, on request 3 to 4 times per year.
The log files form the basis for a selection of podcasts to review. When a selection of podcasts has been reviewed, the service provider will be notified about the result of the audit.
The log files are delivered through a FTP owned by Kantar Sweden. Analysis of the log files are made in collaboration between Kantar Sweden and Kantar Norway.
Results are shared with the service providers individually and are not to be published by Kantar.
Frequency of Audit
Kantar Media Audit will request data for a specific week for all podcasts per service provider. The weeks thus become random over the year, but the same for all service providers.
Approximately 8 - 20 podcasts per service provider and year will be selected by Kantar Media Audit for sample audit.
4. Measurement of Ad Delivery
The scope of this standardisation is limited to metrics for audience measurement. In it’s essence the methodology for podcast audience measurement do however also apply for podcast audio advertising, although some differences are worth noting.
Podcast audio advertising is delivered and measured through two main technologies.
Ads integrated in Content
These ads are integrated in the episode file and thus measured through the audience metrics described in this paper.
This technique is now seldom used for ad delivery, but more often used in editorial partnerships and native content.
Ads Dynamically Inserted in Content
These ads are inserted when the request is made and thus delivered similar to other streamed media in the form of pre-, mid- or post-rolls. They are delivered either by the server or the client stitching ads to the requested file.
In this technique advertising- and campaign reach should be measured through the same methodology as described in this paper. A campaign's podcast reach should thus be defined as the number of unique identifiers the podcast ad has been served to during a given time.
The main metric and often basis for pricing (CPM) of dynamic ad delivery is impressions. Although impressions are similar to listens they have somewhat different attributes, mainly that several impressions can be delivered in one listen (e.g. one pre-roll and mid-roll). To achieve accuracy the Impression tracking should include duration filtering as well as frequency filtering described in this document. Details and values in such filtering can however differ due to ad duration, capping- and frequency rules set by the publisher.
In similarity to all digital advertising it’s recommended to ask the podcast provider or publisher which ad system is used and to include third party ad tracking.
The following service providers have implemented the standardized methodology in the following manners;
BAUER MEDIA - Podplay
NORDIC ENTERTAINMENT GROUP - I Like Radio
The audit concept is called Sample Audit since it is based on random sampling of log files, provided to Kantar Media Audit by the service providers.
The service providers deliver server logs according to this requirements specification.
Log file requiered fields and format
To comply with the measurement functionality the log file needs to contain the following fields in the exact order as stated below. With the exception of bitrate, this can be communicated seperately.
|Timestamp (incl. date)||http status code||http method||IP-address||user agent||URL||bytes served||RSS||bitrate|
Functions of each field:
Appendix 1 - Implementation until Spring 2020
Since Sveriges Radio is a non-commercial organization, an exception was given to deviate from the methodology as long as deviations are described and actions are taken to create comparable results in the audit process.