PSYB32H3 Lecture Notes - Longitudinal Study, Phenotype, Deductive Reasoning
Document Summary
Sometimes longitudinal designs require you to come back every weeks over a period of months, which is a big commitment on the part of people. Selective attrition people will drop out for many reasons, which can give us a bias sample. Cross-sectional designs tests different groups of different ages and then you test them all at the same time. Intellectual functioning of individuals in a study had a curve to it (increase until age 20 then steady and then decrease as you age) according to the cross-sectional results. In a longitudinal study there wasn"t a drop in iq, instead there was increase until age 20-30 and it just stayed the same. Sequential strategy essentially integrates features of both cross-sectional and longitudinal comparisons at the same time: you conduct both cross-sectional and longitudinal design. You can still have attrition problems in sequential strategies but it"s still a powerful design that"s being used more.
