Bernard,

Thanks for the tip.  However, the data is the result of
an IF function and needs to be used for other results.

Is there a way to return a blank cell from an IF
function?  Note that returning "" is not the same as
returning a blank cell because the Tools>Options>Chart
suggetion below only works for truly blank cells.

Your second suggestion (returning =NA()) instead of ""
works for the plot but messes up computations based on
the results.  Specifically, I've been unable to get a RANK
() function call to work correctly with #N/A values in
the range provided.

I've tried using array functions to "clean up" the column
with #N/A before applying Rank() but have run into my
usual consternation with array formulas.

So, the best solution is for me to use a blank cell
return if one exists.  Does it?

Thanks,
Jim