Examine the disadvantages of longitudinal studies (20 marks)
A longitudinal research is a form of research that is used for an extended period of time. The advantages are that it will create in depth-analysis of a particular subject, however there are many disadvantages that follow. The main victim of this form of research is on positivists.
One main disadvantage is the practicality of the research. Since the research is over long period of years, it will be very expensive to run and takes up a huge part of a researcher’s life. For example the 7 up documentary is still running to this day from 1964 and this shows the impacts it has on the researcher. The researcher must still have interest on the subject otherwise the research will become unrepresentative. Furthermore, since it’s a very long study some participants may want to opt out of the research especially if they started when they were young since they could have been forced in. This is called subject attrition and this affects the reliability and representativeness of the research as less people will share their opinions. This is seen in Douglas’ study where more than 500 participants decided to drop out of the research.