Longitudinal Studies (20) Flashcards
Longitudinal Studies Definition
Research of a sample of people, done at regular intervals over a period of multiple years, usually the same group of people to measure changes over time.
What are the Two main types of Longitudinal Studies?
Cohort Studies and Household Panel Surveys
Cohort Studies
Follows a cohort of people, individuals born approximately on the same date or time frame. Sample start as babies and follow a group of people until adulthood but can start at any age.
Household Panel Surveys
Take a cross section of the whole population by randomly sampling households and then treating them all, the people in the household, as members of the sample. So individuals of all ages are included, making it useful to see how families change over time.
Reliability of Longitudinal Studies
Not Reliable. Difficult to replicate. Because groups change over time, attitudes change or because of research method issues like knowing they are being studied.
Data is collected in a standardised manner at different points in time. (Up Study, is taken every 7 years). But can’t control or replicate all the EVs that take place between these periods.
Reliability is also affected by participants who change their qualitative answers to suit the objective of the researcher.
Positive Reliability
Some methods used within longitudinal studies allow for large amounts of information to be collected, as well as analysis and enables comparison.
Reliability Example (BHS)
British Household Survey: Questions cover a wide range of topics of both general and specific interest such as education, employment, political beliefs and behaviours, social and voluntary activities, internet use, aspirations, income and saving, mental and physical health. Over 25 year period consistently.
Representativeness of Longitudinal Studies
Longitudinal studies, not the perfect option to conduct research is that they typically require large sample sizes. So, you must have a large number of cooperating subjects for your research or else it will not realize or be valid.
One of the biggest disadvantages of conducting longitudinal studies is panel attrition. This means that, if researchers are only relying upon the same group of subjects for research that takes place at certain points in time in years, then there is the possibility that some of the subjects would no longer be able to participate because of various reasons, such as changes in contact details, refusal, incapacity and even death, which cuts down the usable data to be drawn to formulate the conclusion.
Representativeness Example (MCS)
Millennium Cohort Study: Had an original cohort of 19,000 children born in the UK between 2000 and 2001. The number of families interviewed at age 5 had dropped to 15,246 (80% of the original cohort). At age 14 which was conducted in 2015 only interviewed 11,700 families (61% of the original cohort). It is expected that it will continue to decrease when they are interviewed at 17, which was last year.
Validity of Longitudinal Studies
Studies involve the use of a collection of data over long periods of time so can determine patterns efficiently. Researchers can learn more about cause and effect relationships and make connections in a clearer manner.
More data over longer periods of time allow for more concise results. Highly valid in determining long term changes are unique in themselves in providing data about individual changes.
Not just a snapshot.
Collects large amounts of rich qualitative data, providing an in-depth insight into society. But analysis of such data can easily be subjective.
Validity Example (Winston/Child of our Time)
R.Winston’s ‘A Child of our Time’: Orginal aim of series was to build up a coherent and scientifically accurate picture of how genes and the environment of growing children interact to make a fully formed adult. But its latest instalment deviated and revealed positive information about youths today, showing they actually drink, smoke and have sex less.
Practical Issues of Longitudinal Studies
Time is definitely a huge disadvantage to any longitudinal study, as it typically takes a substantial amount of time to collect all the data that is required. Also, it takes equally long periods to gather results before the patterns can even start to be made.
Cost. Funding. Can’t afford the cross-section could be chosen instead. Cross-sectional studies are known to be more affordable compared with longitudinal studies and are much quicker in reaching an observational conclusion as they use fewer touch points. Considering that they utilize a sample size that is carefully chosen, rather than subsets, the former can also be more of a help in representing entire populations. The former is observed to be very beneficial when it comes to considering a change in policy, unlike the latter. Better at changing policy as at that date and would run out of relevance.
The researcher may retire and the new one may not have the same rapport.
Theoretical Issues with Longitudinal Studies
Interpretivists would like this method as it provides greater insight into patients lives and everything that influences them, gaining insight and developing a rapport with the participants.
Argue that if we want to explain social actions we have to understand them in a way that the participants do. We learn to see the world from their viewpoint. We need to develop an empathetic understanding which Weber called: ‘verstehen’. The job of sociologists is to uncover the shared interactions and interpretations that makeup society.
Longitudinal studies often use interviews to gather data. So they get to know and build a rapport with their participants which improves the data collection.
Theoretical Issues with Longitudinal Studies Criticisms
Positivists argue that the rapport that Interpretivism empathise is unhelpful. Getting to know and the process of building rapport may become an obstruction and interfere with the behaviour being researched.
Also no control over causes, unsystematic and unstructured.
Ethical Issues with Longitudinal Studies
Nature of longitudinal studies makes it hard to conform to professional ethical guidelines published by the British Sociological Assocation.
- ) Avoiding Harm: In the Up Series, One participant sued to be removed, one had an issue with a portrayal
- ) Deception: Can’t decieve
- ) Consent: Issues if started as children as may feel obliged to continue
- ) Right to Withdraw: Feel pressured to continue. In Up Series, one participant reported feeling this way.
- ) Not Confidential needs to be shared. Though privacy is ensured