Hello
Does anyone know any advantages of qualitative data over quantitative data?
Qualitative data can be more descriptive and can give us a lot of insight into traits, qualities, or characteristics of some behaviour or aspect of psychology that we're exploring (e.g. personality). This means it can be very helpful for diagnosing mental disorders (e.g. through getting a patient to explain and report their symptoms) and conditions and can also help us to better understand the nature of a behaviour that is being studied.
Also, because you're not really standardising qualitative data (i.e. you're not running any statistical tests on it), you can gather and compile a rich source of data on particular individuals to gain insight into uncommon disorders/behaviours (this is often done in case study research where the behaviour/condition being studied is rare in the population).
There are also a number of issues surrounding qualitative research, e.g. social desirability (you construct responses to make yourself look like a 'good person'), misinterpretations of self-reports, difficult to run statistical testing and code responses to gather data for very large samples, etc