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Chapter 1 Longitudinal Data Analysis

Themostcommonmedicalresearch designsis a \pre-post"studyinwhich a singlebaselinehealthstatusmeasurement is obtained,aninterven-tionis administered,anda singlefollow-upmeasurement is theoutcomemeasurement canbe as-sociatedwiththechangein example,if somesubjectsaregivenplacebo whileothersaregivenanactive drug,thetwogroupscanbe comparedto seeif thechangein theoutcomeis di erent forthosesubjectswhoareactivelytreatedas comparedto viewed as thesimplestformof a prospective nition: Alongitudinalstudyrefersto aninvestigationwherepartici-pant outcomesandpossiblytreatments or exposuresarecollectedat longitudinalstudygenerallyyieldsmultiple or \ repeated "measurementsoneach example,HIVpatients may be followedover timeandmonthlymeasuressuch as CD4counts,or viralloadarecollectedto charac-terizeimmunestatusanddiseaseburde nrespectively.

A longitudinal study generally yields multiple or \repeated" measurements on each subject. For example, HIV patients may be followed over time and ... Analysis of correlated data. Statistical analysis of longitudinal data ... number of correct responses minus the number of incorrect responses. We use data on a subset of men and women VPS ...

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  Analysis, Data, Multiple, Chapter, Response, Repeated, Longitudinal, Correlated, Chapter 1 longitudinal data analysis, Analysis of correlated data

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