Terryfic10
New member
- Joined
- Nov 2, 2014
- Messages
- 2
Hi
I have a range of scores given by visitors using a scale from A to F were A is Excellent and F is Poor. These are weighed to give an overall performance score, so lower scores (E or F) can have a dramatic effect on the overall performance score.
The scores are nearly always A or B, but in one recent survey 24 out of 25 rated the experience as A/B and oneperson rated it as F.
My question is this – is it statistically valid to ignorethis grade when calculating the overall performance scale? I seem to remember readingsomething once about ignoring extremes of a range when calculating the mean –or did I imagine it?
Regards
Terry
I have a range of scores given by visitors using a scale from A to F were A is Excellent and F is Poor. These are weighed to give an overall performance score, so lower scores (E or F) can have a dramatic effect on the overall performance score.
The scores are nearly always A or B, but in one recent survey 24 out of 25 rated the experience as A/B and oneperson rated it as F.
My question is this – is it statistically valid to ignorethis grade when calculating the overall performance scale? I seem to remember readingsomething once about ignoring extremes of a range when calculating the mean –or did I imagine it?
Regards
Terry