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Changes in Size: Using Rates vs. Totals

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Introduction to Understanding Trends

Episode 1 • 5m 37s

Up Next in How are we doing? Understanding Trends

  • Changes in Size: Using Rates vs. Totals

    When we explore trends, it's easy to mistake a change in population size for a change in something else. This is why rates are useful. Rates tell us how something is changing per unit or member of the population, which lets us control for changes in the population.

  • Change in Definition

    Lots of the things that interest us have definitions that are not stable over time, especially in areas involving human behavior. When these definitions change, it can affect data on those things. Does this mean definitions should never change? No. But when they do, we should be aware of those ch...

  • Changes in Behavior/Environment

    There is a difference between what is happening in the environment and what we observe in our data. Sometimes, the environment (or a behavior in it) changes in ways that affect our data and create a mistaken impression of change in the thing that really interests us. When you see a big change, co...