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Probabilistic vs. Deterministic Approaches in a Cookieless Future

How probabilistic methods can help you navigate third party cookie deprecation

TL;DR

  • Third-party cookies are likely to disappear, negatively impacting traditional deterministic measurement models that rely on direct data
  • Deterministic models use exact data like cookies and device IDs and will face challenges as privacy regulations increase
  • Probabilistic models infer behavior from aggregated data, making them more adaptable and scalable in a cookieless world
  • Machine learning and probabilistic models, like those used by Northbeam, will grow more accurate and essential for navigating digital marketing's future

The potential deprecation of third-party cookies has sent shockwaves across the industry. Marketers are hustling to adapt as the tools and methodologies they’ve relied on for years are at risk of losing their potency. Whether that cookieless future is a year away or five years away, the best marketers are taking steps today to set themselves up for success in the long run. 

This upcoming adaptation has also fed an ongoing debate about probabilistic vs. deterministic approaches in marketing strategy. In this guide, we’ll talk about both approaches, discuss why they matter, and cover how a probabilistic approach can help marketers prepare for a cookieless future. 

The cookie crisis

Before we get into the nitty-gritty, let’s take a step back to discuss the potential deprecation of third party cookies. While Google Chrome won’t be deprecating cookies just yet, there are indications that we’re moving in that direction sooner rather than later. User preferences and governmental regulations are indicating that privacy is and will remain top-of-mind in the coming years. 

This shift poses a threat to how digital advertising has traditionally been measured and managed. Deterministic measurement, which relies heavily on cookie data, is particularly vulnerable to this change. 

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According to eMarketer, almost 90% of browsers could become cookieless long term. In this potential future, fewer than 20% of users will opt in to sharing cookies when browsing online. This drastic reduction in available data may lead to diminished performance for campaigns that rely solely on deterministic models. 

For marketers, this could be the difference between thriving in a competitive environment and seeing their performance decline. 

Probabilistic vs. deterministic measurement

Let’s dive into definitions. 

Deterministic measurement relies on direct user actions and data points to track and measure behavior. It bases outputs on actual user behavior and builds its measurements off of cookie data, login information, and device IDs. While this method is highly accurate, it is also highly dependent on the availability of direct data, which will become increasingly scarce as security measures proliferate. 

Probabilistic measurement, on the other hand, uses algorithms and statistical models to infer user behavior based on aggregated data points. Instead of relying on exact matches, it identifies patterns and correlations to estimate outcomes. While it might not offer the same level of precision as deterministic measurement, it is far more resilient in a world where direct data points are dwindling. 

The growth of probabilistic measurement

As cookies disappear, so too does the feasibility of relying solely on deterministic measurement. Marketing intelligence platforms like Northbeam have taken this inevitable shift to heart and built their analytics platforms off of probabilistic models. 

By leveraging advanced machine learning models, probabilistic measurement can continue to provide valuable insights even when direct data is limited. It’s adaptable, scalable, and, most importantly, future-proof. 

The best thing about machine learning-based modeling is that it gets more accurate over time as it trains on massive amounts of available marketing touchpoints — we’re talking billions of data points a day about how users engage with your product and behave online. With a longer view, we can expect probabilistic measurement to grow in accuracy and gain even more value as a go-to tool.

The digital vs. traditional divide

Compounding the challenge of accurate measurement is the growing divide between digital and traditional media spending. According to recent projections by eMarketer, U.S. total media spending in 2024 is expected to reach $389.49 billion, with digital accounting for a staggering $302.77 billion of that total. In contrast, traditional media is expected to bring in $86.72 billion. 

This shift from traditional to digital media underscores the importance of effective digital measurement. As more dollars flow into digital channels, the stakes for getting measurement right are higher than ever. Marketers can’t afford to rely solely on deterministic models as digital spend continues to rise — a marketing strategy built on unreliable or diminishing data is not scalable in the long- or even medium-term. 

It’s time to adapt

What does all of this mean for you as a marketer? Now more than ever, you need tools and platforms that are built to not just survive but thrive in a cookieless world. Unlike traditional MTA solutions that rely heavily on deterministic data, Northbeam’s approach is and has always been rooted in probabilistic measurement. This ensures that your campaigns remain effective, even as the data landscape shifts beneath your feet. 

By educating yourself on probabilistic measurement and anticipating the deprecation of cookies, you can stay ahead of the curve and remain competitive in tomorrow’s marketing ecosystem. This isn’t just about improving performance today, it's about setting yourself and your organization up for success in the long term. A future-proof strategy is the best strategy. 

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