why is it a bad thing to use cross sectional data why is cross sectional data used why is cross sectional data a bad thing? why using cross sectional data is bad? why using cross sectional data is a bad thing why cross sectional data is misleading why longitudinal data are used why is using cross sectional data to infer longitudinal changes a bad thing to do? why is a cross sectional sample used for longitudinal data? is cross sectional data a bad thing why is cross sectional data used to predict longitudinal changes bad thing why is cross sectional data used for longitudinal analysis of changes? why use longitudinal data why is cross sectional data misleading why use cross-sectional data why is longitudinal data used to infer change why is cross sectional data used for longitudinal why is cross sectional data bad why is longitudinal data used for longitudinal studies a bad thing why are cross sectional studies bad