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Do you know that as fact? If yes, where can I find that information?
Yes, I know that as a fact. You can find it by reading the employment situation report at U.S. Bureau of Labor Statistics.
Notice the headings:
Employment Situation Summary Table A. Household data, seasonally adjusted
Employment Situation Summary Table B. Establishment data, seasonally adjusted
Thanks...but I cant find the formula for the adjustment.
Do you know what it is?
Well, I know the statistical methodology. They use ARIMA (Auto-Regressive Integrated Moving Average), which in it's simplest form looks at the increase in employment / hiring each year that occurs during this period. It takes the average of that increase and uses THAT figure as a baseline. For example, let's say that:
1. Over the past 50 years, the average increase in employment for each November has been 200,000.
2. The average in every other month (not Nov, Dec, or Jan) has been 150,000.
Then we can surmise that, on average, approximately 50,000 people are added to the rolls each year thanks to the holidays. So when we seasonally adjust the data, we subtract that amount from the total.
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