[R] smoothing again

[Marwan Khawaja]

Hello,
I have a data frame of the form (only the first two columns here)
Age	weight
28	950
29 	1108
30	885
31	1110
.....
Only 15 rows in total. Weight is the mean weight at birth. I used Tukey's
running median smoother, 'smooth' in the eda package, to smooth the data --
there are very few observation at young ages.
Two questions.
1. Is there another (better?) function to smooth such data?  Am I safe using
'smooth'?
2. How best to extrapolate these data -- to additional 5 data points?  In a
previous email, Doug Bates suggested using interSpline but this seems to require
a predictor. Am I wrong?
TIA for your help
Marwan


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Marwan Khawaja   -   http://webfaculty.aub.edu.lb/~mk36/     If you have MS
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