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
time horizon of the study.
Purpose of the study: Hypotheses testing
We want to explain the relationships between the satisfaction and user’s personal data and the two phone’s performance. We have intermediate variables (age, gender). We also have independent variables(application, cost the phone)and dependent variable(user’s satisfaction). So we think Hypotheses testing can help us enha
Why do men who have returned from their military services (a.k.a 복학생) seem to eat alone at the school cafeteria?
People with Companions
People with a BAG
More Space
More Time
More Space
Inefficient Use of Space
Low Turnover Rate
time clarifying options and looking at costs. In examining possibilities for substitution, economists look at costs and benefits at the margin.
경제학자들은 그들의 개인주의적 접근방식 때문에, 사회적 문제들을 해결하기 위해 시장에 의지하는 경향이 있다. 문제를 분석하는데 있어서, 경제학자들은 선택할 수 있는 조건들을 명확화
weakness, opportunity, threat)
Strength- strength of proposal is easy to understand and simple. And it can
help many people reducing time. The most important thing is that feasibility of
this proposal is very high.
Weakness- the biggest weakness of this proposal is absence of creativeness. All
people can think this proposal and actually, this kind of application is co