Definition

Noun: A statistical technique applied to economic data to remove the predictable, recurring variations that occur at specific times each year (e.g., holidays, weather patterns), thereby revealing the underlying trend and cyclical movements.

Usage

This term is used primarily in economics, finance, and official statistics. It describes the process or the result of modifying raw data to account for regular seasonal patterns.

Examples

• The reported unemployment figures include a seasonal adjustment to account for summer hiring.
• Economists rely on the seasonal adjustment of retail sales data to assess true consumer demand.
• The seasonal adjustment for construction activity is significant due to winter slowdowns.

Advanced Usage

• To seasonally adjust (verb phrase): The act of applying a seasonal adjustment.
  • The bureau will seasonally adjust the monthly employment figures.
• Seasonally adjusted (adjective phrase): Describes data that has undergone this process.
  • The seasonally adjusted inflation rate showed a modest increase.

Variants and Related Words

• Seasonality (n): The characteristic of being subject to seasonal variation.
  • The strong seasonality of tourism affects the local economy.
• Deseasonalize (v): A synonym for applying a seasonal adjustment to data.

Synonyms

• Deseasonalization
• Seasonal correction

Notes

"Seasonal adjustment" is a technical term. The core concept is isolating the "signal" (the fundamental economic trend) from the "noise" of predictable, calendar-related fluctuations. It is not used in casual conversation but is essential for accurate economic analysis and policymaking.

Noun

1. a statistical adjustment made to accommodate predictable fluctuations as a function of the season of the year
   • seasonal adjustments for housing starts must be made in mid-winter