On fred.stlouisfed.gov there are two types of gdp data: seasonally adjusted and not seasonally adjusted. Can anyone please explain the difference and how they are calculated? Also I am struggling to understand quarterly data. Why will there be 3 different news regarding q4? (in january, february and march). I don't understand how the quarterly growth is calculated . For 2016 I see on fred.stlouisfed.gov: q1 18281, q2 18450, q3 18675; q1 1.3%, q2 3.7%, q4 5%. On traidngeconomics I see: q1 0.8%, q2 1.4 %, q3 3.5%. I don't see the relation between all of these numbers. Can anyone with the time, knowledge and willingness, please explain?
For the seasonal adjustment: https://blog.bea.gov/2015/05/20/accounting-for-seasonality-in-gdp/ For some guidance on the multiple estimates: http://www.bea.gov/newsreleases/national/gdp/gdpnewsrelease.htm https://blog.bea.gov/2015/07/13/why-does-bea-revise-gdp-estimates-2/