Logrithmic Trendline Not Available

kkknie

Well-known Member
Joined
Apr 29, 2002
Messages
677
I've got the following data plotted on an X-Y chart:

Code:
Time   X1      X2
0      29.32   59.39
3      30.94   56.98
6      32.85   54.34
9      33.53   52.58
12     34.73   51.53
15     35.57   50.45
18     36.21   49.72
21     36.87   49.39
The trends plot just fine, and are obviously logrithmic. However, when I try to add a trendline and get the logrithmic equation for the line, that option (as well as the power option) is grayed out.

If I change the chart to a logrithmic type, all options for trendlines are available and the equation is correct (I checked by hand).

I would really like to display it on a linear chart with a logrithmic trendline. It's mostly for aesthetic purposes than for anything else. Any thougths on what I am missing?

Thanks,

K
 

Excel Facts

What did Pito Salas invent?
Pito Salas, working for Lotus, popularized what would become to be pivot tables. It was released as Lotus Improv in 1989.

Bob Rooney

Board Regular
Joined
Jul 25, 2006
Messages
169
Are you using the time column as part of your data, or are just the X1 and X2 datasets in use? I would think that the time=0 data point is what is causing the problem.

EDIT: Just checked and could replicate your problem only if using the time series data. The time = 0 is the source of the problem.
 

kkknie

Well-known Member
Joined
Apr 29, 2002
Messages
677
You would think that someone who took as much math in college as I did would have been able to spot that!

Thanks a bunch.

K
 

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