1) Quantitative research uses statistical analysis to understand the size and demographics of an audience. It is conducted by research companies like NRS and ABC who survey large, random samples to gather information on things like purchase behaviors. 
2) Qualitative research uses interviews, focus groups, and observations to gain a deeper understanding of who comprises an audience and what they want. It provides more specific details than quantitative but from a smaller sample size. 
3) Different types of research like socioeconomic status, psychographics, and geodemographics further segment audiences based on income, interests/personality, and where they live to better target products. While each provides unique insights, qualitative research is most important for a new publication to