primary and secondary research Mahmoud Abdeljaber

 Qualitative Data: that approximates or characterizes but does not measure the attributes, characteristics, properties, etc., of a thing or phenomenon. Qualitative data describes whereas quantitative data defines. The number of people who like/dislike a product or idea, usually taken on a graph or chart.

Data that can be quantified and verified, and is amenable to statistical manipulation. Quantitative data defines whereas qualitative data describes.
Data that cannot be measured, such as advice (on how to improve a product) or praise for how well it's done.

Experiments, investigations, or tests carried out to acquire data first-hand, 

Rather than being gathered from published sources.

Primary research: Experiments, investigations, or tests carried out to acquire data first-hand, rather than being gathered from published sources.

Secondary research: Primary data that was collected by someone else or for a purpose other than the current one.

Advantages and Disadvantages of quantitative and qualitative data.  

Advantages of qualitative data: Qualitative research is useful during the early stages of a study when the researcher may be unsure of exactly what will be studied or what to focus on. This type of research does not need a strict design plan before it begins. This gives the researcher freedom to let the study unfold more naturally. Another advantage to qualitative research is the researcher gains more detailed and rich data in the form of comprehensive written descriptions or visual evidence, such as photographs. This type of research looks at context and social meaning and how it affects individuals, which is advantageous particularly in the social sciences.

Disadvantages of qualitative data: The researcher of a study using qualitative research is heavily involved in the process, which gives the researcher a subjective view of the study and its participants. The researcher interprets the research according to his or her own biased view, which skews the data gathered. Another disadvantage is that this research method is very time consuming and can last for months or even years.

Advantages of quantitative data: Quantitative research allows the researcher to measure and analyze data. The relationship between an independent and dependent variable is studied in detail. This is advantageous because the researcher is more objective about the findings of the research. Quantitative research can be used to test hypotheses in experiments because of its ability to measure data using statistics.


Disadvantages of quantitative data:

The main disadvantage of quantitative research is the context of the study or experiment is ignored. Quantitative research does not study things in a natural setting or discuss the meaning things have for different people as qualitative research does. Another disadvantage is that a large sample of the population must be studied; the larger the sample of people researched, the more statistically accurate the results will be.