Study Ludwig (1970): study US 1965
- University students, University of Wisconsin, USA, 196?
- N = 45
- Non Response
Questionnaire: Paper & Pencil Interview (PAPI)
Every night for 20 days.
- Authors's Label
- Our Classification
- Repeated closed question on to what extent Ss felt like doing calm and tranquil things during the day, rated each night on q 4-point scale for at least 20 days.