추출된 경기 변동 요소의 상위 30%와 하위 30%를 임계치로 설정하여 상위 30%보다 큰 경우를 호황기, 하위 30%보다 작은 경우를 불황기로 각각 정의하였다.
The upper 30% and lower 30% of the extracted economic fluctuation factors were set as thresholds, and a case greater than the upper 30% was defined as a boom period and a case smaller than the lower 30% as a recession period respectively.