URGENT MATH HELP - SEE PIC - 2 lines below 0 line Calculate % Away from 0 line

[axecapital]

2 trend lines are below the 0 Line, after both lines cross HOW do i calculate the % how far they are away from the 0 line?

Look at picture below
Let's say the cross where the BLUE line and GREEN line happen (blue line is above the green line)

GREEN line is at -95
BLUE line is at -50

The cross happened at -110 both lines crossed at -110
That cross represents 100%

How would I calculate it to say the lines are at -55% let's say below the 0 line.

 

[Steven G]

Please tell us how you do these problems and if you are right, we will tell you that you did a great job or if you are wrong we will give you a hint on how to go in the right direction. So please post back showing your work. Thanks!

 

[Dr.Peterson]

2 trend lines are below the 0 Line, after both lines cross HOW do i calculate the % how far they are away from the 0 line?

Look at picture below
Let's say the cross where the BLUE line and GREEN line happen (blue line is above the green line)

GREEN line is at -95
BLUE line is at -50

The cross happened at -110 both lines crossed at -110
That cross represents 100%

How would I calculate it to say the lines are at -55% let's say below the 0 line.

View attachment 19688

I can't make any sense of what you are asking. Please explain in context, and with more words so we can figure out what you mean.

In particular, what do "the % how far they are away from the 0 line" and "that cross represents 100%" mean?

 

[JeffM]

Index numbers can be tricky, particularly when it makes sense to have positives and negatives.

I am guessing here because your vocabulary is a bit obscure. It looks as though a new time series, shown in green, was spliced to an old time series shown in red. There is a third time series shown in blue. All three are expressed in terms of index numbers. You want to renumber the scale so that 100 is the value where green and blue intersect, am I correct? And you want to start at the time when the green starts and the red ends, is that it?

Well the first problem is that the blue and green lines intersect twice, but there is no assurance that the value is the same both times. In fact, it appears that they differ. How do you want to handle that issue?

If you don't immediately get what the issue is, let me explain it with an analogy. In the summer, my wife and I are always comparing the outside temperature and inside temperature to figure out whether to open all the windows and turn off the air conditioning or to shut all the windows and turn on the air conditioning. Let's say it is 71 degrees inside and outside when we check at 10 pm on Monday night. And let's say it is 69 degrees inside and outside when we check Thursday morning. Both days we have equality between inside and outside, but 69 is not equal to 71. So to keep the analogy going, do you want to choose 71 or 69 as the new 100?