A Primer in Longitudinal Data Analysis by Toon W Taris

By Toon W Taris

This available creation to the speculation and perform of longitudinal examine takes the reader in the course of the strengths and weaknesses of this type of learn, making transparent: the way to layout a longitudinal learn; the best way to acquire facts such a lot successfully; tips on how to make the easiest use of statistical ideas; and the way to interpret effects. even supposing the booklet presents a huge review of the sector, the point of interest is often at the sensible matters coming up out of longitudinal learn. This e-book offers the scholar with all that they should start and acts as a handbook for facing possibilities and pitfalls. it's the excellent primer for this starting to be sector of social examine.

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Sample text

You may judge the performance of your car differently after having driven it for two days than after two years, and a couple in marital therapy may evaluate each other differently after a session or two, even if nothing has actually changed.

Further, at the last wave of the study, hard-to-reach households were undersampled by half, and twice as much ®eld effort was devoted in each case to making contacts with the remaining half-sample during the last month of the ®eld period. The primary reason for attrition during follow-up waves in longitudinal studies is that interviewers are unable to contact people who participated in earlier waves of the study (American Statistical Association, 1974). For example, it can be dif®cult to trace respondents who have moved between the waves of the study.

For example, suppose that a sample to be followed through time consists of equal numbers of males and females, at least at the ®rst wave of the study. However, the nonresponse at wave two was selective, and completely accounted for by gender (that is, MAR); males were more likely to drop out of the study than females. 2. 75 for females, respectively. This resulted in an overrepresentation of the females (who comprise 60 per cent of the sample at wave 2) and, conversely, in an underrepresentation of the males (comprising only 40 per cent of the sample).

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