How to Create Successful Demand Forecasts

In both weather and retail planning, inaccurate forecasts cause mild discomfort at best and catastrophic consequences at worst. It’s not fun to come home soaking wet after a day when sunshine was predicted, and it’s bad for business when excess inventory that didn’t sell has to be marked down. At Alloy, we can’t say that we’ve fully nailed meteorology, but we do have expertise in retail forecasting, and we spend a lot of time leveraging best practices to benefit our clients.

When done correctly, retail forecasting relies less on guesswork and more on thoughtful data analysis. The concept of forecasting has been around for a long time, but consumer brands that haven’t updated their methodologies are probably falling behind the competition — yesterday’s standard procedures don’t cut it anymore in today’s retail environment. For instance, our Lead Data Scientist Aaron Hoffer recently wrote an article for insideBIGDATA about common mistakes brands make when preparing forecasts.

The first mistake he highlights is forecasting sales instead of store-level demand. This strategy can be harmful for two reasons: it’s prone to under-forecasting, because unconstrained demand isn’t considered in the formula, and it tends to average out seasonal trends and outliers that may be important.

The second forecasting pitfall that Aaron discusses is treating all misses as equal. Most cookie-cutter forecasting models will set symmetric error bounds, and if results fall outside of those bounds, it’s considered bad. While it’s true that you always want your forecasts to be as accurate as possible, the reality is that different misses have differing levels of severity. For instance, a produce company might view understocking apples as preferable to overstocking them, since spoiled food is a guaranteed sunk cost. Brands should customize their forecasting models to reward and penalize the specific metrics that are important for their products.

Those are two examples of don’ts in retail forecasting, but what about the dos? We’re excited to release today a new white paper that looks at the three key principles of modern forecasting for brands. They are:

  • Use an integrated approach
  • Keep methodology transparent
  • Make results actionable

In the white paper, we cover everything from data collection to explaining model results, with a focus on maximizing the usefulness of the forecast across an organization. Gone are the days when forecasting was an early and isolated step of retail planning; to remain competitive today, brands must continually keep their forecasts up-to-date and use sound data science. And even though that data science may be mathematically complex, the components and end results of a forecast should be understandable for all business units — not just the analytics team.

In the coming weeks, we’ll explore the process of successful forecasting in greater detail here on our blog. In the meantime, check out our Fundamentals of Modern Demand Forecasting white paper for actionable tips your company can apply to improve forecasting. Have questions? Don’t hesitate to reach out to us at