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The longitudinal approach to the study of immigrants has many undoubted advantages, to which Professor Appleyard and others have drawn attention (Appleyard, 1964, 1972). When observations are made and information obtained at each stage of the migratory experience, from the original decision to emigrate onward, the data obtained are more reliable than when the researcher must rely upon retrospection. Furthermore, by following a specific cohort over a period of time, it is possible to measure the direct effect of length of residence without the distortion that arises when the characteristics of different cohorts are
Goldlust et al. (Sat,) studied this question.