Add "accuracy bar" in estimate evaluation
To give more intuitive feedback to participants about how accurate their estimate was relative to the actual value, provide an "accuracy bar" that represents
- A range of relevance (the entire width of the bar)
- An indicator of the actual value
- An indicator of the estimated value
E.g.,
{------|---x--}
Where
-
{
is the minimal relevant value -
}
is the maximum relevant value -
|
is the actual value -
x
is the estimated value
When the question involves a relative change, we'll need three indicators:
{----o-|---x--}
Where all marks stand for the same thing as above, but the o
indicates the starting value.
We might add additional feedback in the form of a color gradient on the scale.