1.1 Study Designs
․Retrospective Studies
․Prospective Studies
※ Survival Analysis
; Deals with analysis of data that have "time to an event".
※ Survival time
; Time until an event occurs.
※ Event
; a. relapse of a disease
b. death
c. response to a treatment
; Economical,
To obtain answers quickly because the cas
Ⅰ. 자료의 처리
표본추출과 실제 조사의 과정을 통해 얻어진 원시자료(raw data)들은 구체적인 분석을 실시하기 전에 이용 가능한 형태로 변환되어야 한다.
조사를 통해 자료들을 얻었다고 하더라도 조사 자체가 불완전하거나 자료의 일부 또는 전부를 쓸 수 없는 경우도 있으므로 분석에 사용될 수 있
04. The incidence of failure following single-visit endodontic therapy
Richard B.Pekruhn. J Endod 12:68-72. 1986
Introduction
- Single-visit 근관 치료와 multiple-visit 근관 치료사이의 실패율 유의차 없음
- Single-visit 근관 치료는 다음 세 가지로 분류
① 초기접근, 근관 형성, 근관충전이 single-visit 근관 치료로 완료
② 통증
1. INTRODUCTION TO THE INDUSTRY
Oil refining business began commercial operation of its 1st oil refinery. It has expanded facilities on two occasions, and today, oil refining business is a refining capacity of almost 580,000 barrels/day and keeping pace with such achievements, the common oil refining business operates light oil desulfurizing facilities and gasoline manufacturing facilities. Oil
Introduction
Today’s China
Before we elaborate on our subject, we thought it is important to understand about the present situation of China. Thus, by comparing both China’s current and expected future situation, we’ve divided our sub-directions.
After implementing an open economy, China has been rapidly developing and eventually, they took a pos