Unless all the respondents in the original sample complete all phases of a longitudinal design,there is a possible problem due to
A) selection bias.
B) attrition.
C) extrapolated data.
D) social desirability.

Question

Quizplus · Accepted Answer

Attrition refers to the loss of participants over time in a longitudinal study. This can lead to a biased sample if those who drop out differ systematically from those who remain in the study. Therefore, attrition is a possible problem in a longitudinal design when not all respondents complete all phases.

Unless All the Respondents in the Original Sample Complete All