Percentage Change For Fixed Scale

[PaladinTom]

Hi All,

I'm hoping someone can help me out with calculating a percentage
change on a FIXED scale.

Consider the percentage change using whole numbers. For instance, a
percentage change from 2 to 4 is 50%, whereas a change from 6 to 8 is
25%.

However, on a FIXED scale of 0 to 10 both of these changes should be
the same as they both increased 2 points along a 10 point scale which
is 20%. The numbering of the scale is arbitrary as it could easily
have been labeled"A" through "K". The point is is that both values
moved the same distance over the fixed scale.

I hope I'm describing this clearly. Thanks in advance for any help!

Regards,
Tom

 

[egun]

Seems to me that going from 2 to 4 is a 100% increase, and 6 to 8 is 33.3%.

In any case, let's say your fixed scale goes from MIN to MAX, and you are
comparing two points on that scale, A and B. Then the percent change going
from A to B along the fixed scale would be (assuming MIN < MAX):

PERCENT = (B-A)/(MAX-MIN)

I guess I'm also assuming the A and B are contained within the range
(MIN,MAX), but that doesn't have to be the case for the formula to work.

HTH,

Eric

 

[PaladinTom]

Seems to me that going from 2 to 4 is a 100% increase, and 6 to 8 is 33.3%.

In any case, let's say your fixed scale goes from MIN to MAX, and you are
comparing two points on that scale, A and B.  Then the percent change going
from A to B along the fixed scale would be (assuming MIN < MAX):

PERCENT = (B-A)/(MAX-MIN)

I guess I'm also assuming the A and B are contained within the range
(MIN,MAX), but that doesn't have to be the case for the formula to work.

HTH,

Eric

Hi Eric,

Awesome. Thanks for the quick response... and the great quote in your
sig!

One of my Steven Wright faves: "I have a decaffeinated coffee table.
You can't even tell the difference."

Best,
Tom