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Download full textCohen, Allan S.; And Others – 1973
This paper presents the description and several applications of a model which can be used to determine how long a researcher must wait for the return of completed mail questionnaires to be sure the data collected reflect the true values of the parameters of interest. This model proposes to fit two linear time trend lines to a set of mailed…
Descriptors: Black Youth, Certification, Data Analysis, Data Collection
