R help - Feb 2014 - Plotting a loess line when the abcissa variable has numerous NA's

I have a situation in which I want to plot a variable Y against X, and 
then to add a loess line to that plot.  My X variable is 366 elements 
long, and about 1/3 are NA's, scattered through the list.  None of the 
corresponding Y's are NA's.  Everything I?ve tried so far, by mimicking 
examples from four different books, produces a messy scramble of lines 
when I try to plot the loess curve.  How can I deal with this situation?
Thanks for any help.

On Feb 8, 2014, at 12:28 PM, David Parkhurst wrote:
> I have a situation in which I want to plot a variable Y against X, and then
to add a loess line to that plot.  My X variable is 366 elements long, and about
1/3 are NA's, scattered through the list.  None of the corresponding Y's
are NA's.  Everything I?ve tried so far, by mimicking examples from four
different books, produces a messy scramble of lines when I try to plot the loess
curve.  How can I deal with this situation?
Why not remove rows with NA. If you think otherwise, then tell us where you
think we should plot the tuples c(NA, Y_i).

-- 

David Winsemius
Alameda, CA, USA