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Model of a longitudinal study in which 983 students were surveyed in 1984 and then again in 1985, 19

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Model of a longitudinal study in which 983 students were surveyed in 1984 and then again in 1985, 1986, 1988, and 1992. Note their ages and also the number of students who returned the questionnaires (N). Source: Data from Galambos, Barker, & Krahn, 2006.
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