One of the advantages of the SIPP over other data sources on wealth is the large sample of households that it interviews. The 2009 figures are based on more than 36,000 households (unweighted), ...

Pew Research Center’s team of demographers, economists and other analysts accesses and uses a wide variety of publicly available data sources to conduct its population research. Much of this data is ...

Primary research is the process of gathering data directly from original sources as opposed to collecting information from research that others have done. Information can be obtained by ...

Market research usually combines primary information, gathered directly from consumers, and secondary information, which is data available from external sources. Formal market research began in ...

Qualitative research in dentistry This paper explores the most common methods of data collection used in qualitative research: interviews and focus groups. The paper examines each method in detail ...