Goodfellow, Marianne; Kiernan, Nancy-Ellen; Ahern, Frank; … - In: Evaluation Review 12 (1988) 6, pp. 638-654
Researchers examining the effects of programs, in this case a state-level pharmaceutical assistance program for the elderly, sometimes must rely on multiple methods of data collection. Two-stage data collection (e.g., a telephone interview followed by a mail questionnaire) was used to obtain a...