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
질적 자료의 정리
- 도수분포표 (frequency table)
데이터 각 값의 출현 도수를 세거나 몇개의 구간으로 나누어 각 구간에 속하는 데이터의 개수를 세어서 정리한 표.
1) 작성 방법
1. 자료의 개수를 센다.
2. 자료의 최댓값과 최솟값을 구한다.
3. 계급의 수를 정한다.
4. 계급의 폭을 구한다.
5. 계급의
distribution system to take advantage of economies of scope, is widely used. Moreover, we were able to find out that this system might cause not only economies of scale but also economies of scope. Airline industry regards individual flight as distinct product. They use hub airport and spoke airport to reduce cost. However, we can’t easily guarantee that airline industry will easily enjoy this
III-III. How the product works.
In case of Nexus one, it's not purchasable in the outdoor market. It should be purchased through the internet along with the activation process. It looks just as simple as the I-phone. the gray button on the bottom's a track-ball which can be used as a mouse not only by touching the screen Nexus one also could be used by rolling the ball. Free stamp's on the pho
a. 일선판매망(GRASS ROOTS)
제품이나 서비스를 구입하고 사용하는 고객과 직접 접촉하는 일선 판매망(grass roots)혹은 판매요원(sales forces)의 개별 예측치 들을 합성하여 예측치를 구하는 방법
ex)편의점 중국집 등등
* 지역별 특성이 다소 다르게 나타날 수 있기에 해당지역의 사회적 특성