trend lines on plots with negative X values

[mrarx]

When I scatter plot a set of data with negative x values and add a trend
line, the trend line extends to x=0, when I would expect it to just cover the
data range.

eg
-2.3 1
-2.4 0
-2.7 -1
-3 -4

This is without the extending the trendline using the forecast options.

if I plot positve x values the bug does not happen

eg
2.3 -4
2.4 -1
2.7 -2
3 3

I am using Excel 2007 (12.0.6331.5000)

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[Mike Middleton]

mrarx -

When I scatter plot a set of data with negative x values and add a trend
line, the trend line extends to x=0 <

Yes, this behavior in Excel 2007 is unexpected and is different from
previous versions of Excel. I agree that it is an "undesirable feature,"
i.e., a bug.

- Mike Middleton
http://www.MikeMiddleton.com
Software and Books for Decision Analysis and Data Analysis