group_by: ["date"] on the second.
The headline is not the average of the daily values, and should not be. Each daily row is computed from that day’s answers; the headline is computed from every answer in the period at once.
How this example works
- Headline: no
group_by. One row. - Daily:
group_by: ["date"]. One row per UTC day with answers, dates ascending. Days with no answers have no row. - Show both, and the gap between the average and the headline, to see why you never derive one from the other.
Why the two differ
The same is true of weeks and months: a monthly score is one call over the month, not the mean of its weeks. See Visibility over time for weekly and monthly lines.
Common follow-ups
Visibility Score with change
Add the change against the previous period.
Visibility over time
Weekly and monthly buckets.