Seasonal adjustment is a statistical technique that aempts to measure and remove the influences of predictable seasonal patterns to reveal how employment and unem-ployment change from month to month.
Over the course of a year, the size of the labor force, the levels of employment and unemployment, and other measures of labor market activity undergo fluctuations due to seasonal events including changes in weather, harvests, major holidays, and school schedules. Because these seasonal events follow a more or less regular pattern each year, their influence on statistical trends can be eliminated by seasonally adjusting the statistics from month to month. These seasonal adjustments make it easier to observe the cyclical, underlying trend, and other nonseasonal movements in the series. In the absence of seasonally adjusted data, year over year comparisons are the only option.
While California's Employment Development Department (EDD) releases seasonally adjusted total nonfarm employment for each major metropolitan area within the state, they do not produce seasonally adjusted employment by industry for each major region. Beacon Economics, LLC's seasonally adjusted employment estimates enable month over month comparisons of employment changes that enable both policymakers and private businesses to understand short-run changes in labor market conditions that are often missed in year over year comparisons