Last Topic: 9:22:17am, 07/22/2022
Last Post: 1:43:39pm, 01/23/2022
[LFAQs-redacted-quote]
The primary thing that segregates low and moderate "quality" appears to be cross-sectional vs longitudinal design. However, since none are experimental, all are subject to confounds.
With large numbers, the cross-sectional analysis should estimate the mean longitudinal effect.