When to extend an experiment by seven days
A second week can help when your first week was uneven or the signal was small.
Keep the same action and time of day where possible for seven more days.
Open my labWhat to notice
Compare both weeks; note whether circumstances changed.
Record a 1–10 daily rating and whether you tried the activity. A missed day is useful context; it does not erase the rest of your week. At the first checkpoint, you can continue for seven or fourteen days, or choose something else.
How to interpret your result
An extension improves the amount of observation but is not a controlled trial.
Keep your original prediction separate from the daily ratings. Your starting rating, number of observations and changing circumstances all matter. A personal week can reveal a pattern worth exploring, but it cannot establish cause or statistical significance.
Evidence and context
This guide describes a small personal practice. For the wider research context, see Well-being-focused interventions: network meta-analysis of randomized trials. Research findings describe groups and study conditions; your lab records describe your own experience.