Sobal, Jeffery; DeForge, Bruce R.; Ferentz, Kevin S.; … - In: Evaluation Review 14 (1990) 6, pp. 711-722
Homogeneous groups surveyed about issues of concern to them may require few follow-ups because respondents provide role-specific answers representative of others in that role. The authors analyzed three questionnaire mailings to 1,535 physicians that produced 977 responses (604 first, 252...