縱向研究是在需要持續收集事實資訊時用的。在縱向研究中，研究人群會定期訪

縱向研究是在需要持續收集事實資訊時用的。在縱向研究中，研究人群會定期訪問，通常在很長一段時間內，收集所需的資訊。這些間隔不是固定的，所以它們的長度因研究而异。間隔可能短至一周，也可能長於一年。無論間隔大小如何，每次收集的資訊類型都是相同的。儘管收集的數據來自同一研究人群，可能來自，也可能不來自同一受訪者。一個縱向研究可以看作是一系列重複的橫斷面研究。

結果 (英文) 1:

Longitudinal studies are used when you need to continue to collect information about the facts.
In the longitudinal study, the study population regularly visit, usually within a long period of time to collect the required information.
These intervals are not fixed, so that their length varies by research. Interval may be as short as one week or may be longer than a year.
Whatever the size of the gap, each type of information collected are the same.
Although the data collected from the same study population, may come or may not come from the same respondents.
A longitudinal study can be seen as a series of repeated cross-sectional study.

結果 (英文) 2:

Longitudinal studies are used when it is necessary to collect factual information on an ongoing basis.
In longitudinal studies, the study population visits regularly, usually for a long time, to gather the information they need.
These intervals are not fixed, so their length varies from study to study. The interval may be as short as a week or longer than a year.
The type of information collected is the same each time, regardless of the size of the interval.
Although the data collected came from the same study population, it may or may not come from the same respondent.
A longitudinal study can be seen as a series of repeated cross-sectional studies.

結果 (英文) 3:

Longitudinal research is used when continuous collection of factual information is required.
In the longitudinal study, the research population will visit regularly, usually for a long time, to collect the required information.
These intervals are not fixed, so their length varies from study to study. The interval may be as short as one week or as long as one year.
Regardless of the size of the interval, the type of information collected each time is the same.
Although the data collected are from the same study population, they may or may not come from the same interviewee.
A longitudinal study can be regarded as a series of repeated cross-sectional studies.