who practiced the case study method of observation
Participant observation Participant observation is one type of data collection method typically used in qualitative research. It is a widely used methodology in many disciplines, particularly cultural anthropology, European ethnology, sociology, communication studies, human geography and social psychology. Its aim is to gain a close and intimate familiarity with a given group of individuals (such as a religious, occupational, sub cultural group, or a particular community) and their practices through an intensive involvement with people in their cultural environment, usually over an extended period of time. The method originated in the field research of social anthropologists, especially Bronisław Malinowski and his students in Britain, the students of Franz Boas in the United States, and in the later urban research of the Chicago School of sociology.
Factor analysis Charles Spearman pioneered the use of factor analysis in the field of psychology and is sometimes credited with the invention of factor analysis. He discovered that school children's scores on a wide variety of seemingly unrelated subjects were positively correlated, which led him to postulate that a general mental ability, or g, underlies and shapes human cognitive performance. His postulate now enjoys broad support in the field of intelligence research, where it is known as the g theory.