Yesterday, i stumble upon some of my country macroeconomic data, and i found some interesting pattern on quarter-on-quarter gdp growth, almost every Q4 and Q1 has a negative growth. After checking another country's data, i can't find the same pattern. later i learned that my country data was probably non-seasonally adjusted data, since when i search for non-seasonally adjusted(NSA) GDP for another country, they also show similiar pattern.
My question is :
Why did NSA GDP usually drop on Q4 And Q1, what causes this pattern?
Did this also mean we're usually in recession in Q2 (Since Q4 and Q1 growth are negative)? After the Q2 2020 macroeconomical data released, there are a lot news about our country entering technical recession, even if our Q1 yoy growth was still positive.
Are seasonally adjusted GDP growth are the same as Year-on-year GDP growth?
What data do we use to define recession? Seasonally adjusted one or Non-Seasonally adjusted one?