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Table 1 Comparison of recurrent cross-sectional and trajectory analysis

From: Analyzing longitudinal qualitative data: the application of trajectory and recurrent cross-sectional approaches

Considerations

Recurrent cross-sectional analysis

Trajectory analysis

Research focus

Describe the differences between time points

Describe how process or experience changes over time

Sample considerations

The cohort at each time point may be the same or different

May be preferred if sample is highly transient or has high mortality over study duration

Must maintain same cohort

Theoretical approach

Determined by the research question

Any analytic approach may be used consistently throughout the study

Determined by the research question

Any analytic approach may be used consistently throughout the study

Level of data analysis

Whole sample (or subsamples)

Individual people or individual groups (e.g., families)

Timing of analysis

May analyze as each time point is completed

Must wait until data is collected at all time points