--- title: "What is High Density Interval (HDI)?" url: https://fibr.ai/glossary/high-density-interval-(hdi) description: "A High Density Interval (HDI) shows the likely range of a measurement, helping marketers make informed decisions by understanding data uncertainty and risks." last_updated: 2026-05-05T11:56:37.565225+00:00 --- In marketing analytics, a High Density Interval is a statistical range that shows where most likely values for a measurement lie. It is often used in predictive models to describe uncertainty. For example, if conversion rates are predicted between 3% and 5% with 90% certainty, that range is the HDI. Marketers use HDI to make informed decisions despite data uncertainty. It shows not just an average but a likely range, helping teams understand risks and probabilities in campaigns. ### Explore more Glossary terms ##### Hypothesis In marketing, a hypothesis is a clear assumption or prediction made before running an experiment. It defines what change is being tested and the expected outcome. Read More ##### Hyper-personalization Hyper-personalization is tailoring marketing messages to individuals using real-time data such as behavior, browsing history, or purchase patterns. It goes beyond simple segmentation by creating experiences unique to each user. Read More ##### High Density Interval (HDI) In marketing analytics, a High Density Interval is a statistical range that shows where most likely values for a measurement lie. It is often used in predictive models to describe uncertainty. Read More ##### Hesitation Time Hesitation time measures how long users pause before interacting with a form field or webpage element. It indicates confusion, uncertainty, or difficulty in decision-making. Read More ##### Hero Image A hero image is a large, prominent banner placed at the top of a webpage, often on the homepage or landing page. It usually includes visuals and a call-to-action that introduces the brand or key offer. Read More ##### Heatmaps Heatmaps are visual tools that show where users click, scroll, or focus their attention on a webpage. They help marketers see which areas draw the most interaction and which sections are ignored. Read More Delaware, USA Subscribe to our newsletter for exclusive updates and insights.