Phil -
Excel offers to extend a trendline beyond the data is is based on, but
you aren't given the option to retract the endpoints of the trendline so
it spans a shorter range.
You could use LINEST or SLOPE and INTERCEPT and construct your own
trendline as a new series in the chart.
- Jon
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Jon Peltier, Microsoft Excel MVP
http://www.geocities.com/jonpeltier/Excel/index.html
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> Is there a way to keep Excel from plotting a trendline the
> same as using #N/A to keep it from plotting series points?