There's a bunch of popular hats around the world so it depends :D
Answer:
Interrupted time series
Explanation:
According to Wikipedia, Interrupted time series analysis, sometimes known as quasi-experimental time series analysis, is an approach for the analysis of a single time series of data known or conjectured to be affected by interventions (controlled external influences).It refer to the specific point at which the intervention was implemented and allow researchers to examine the effect of an intervention where multiple observations are obtained prior to the intervention to establish a baseline.
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What finally enabled sturdy skyscrapers was sturdy steel, which is a mixture of metals and other elements, such as carbon, which is distinguished by low cost on one hand and strength and flexibility on the other.
