Dear R Users,
Before running ksmooth( ), a suitable bandwidth selection is needed. I use
some functions for this task and receive these results for my data:
width.SJ(y,nb=100,method="ste") : 40.25
bcv(y,nb=100) : 40.53
ucv(y) : 41.26
bandwidth.nrd(y) : 45.43
After implementing the function ksmooth(x,y, bandwidth= each of
abovementioned bandwidths), I have some NAs in output with regard to each
bandwidth. But if the bandwidth be equal to 62 or bigger, then the function
ksmooth(x,y, bandwidth=62 or bigger) works without NA,i.e., the bandwidth must
be at least 62 in order to not have NA in output.
That was the first case. In second case, I have to choose bandwidth bigger
than the number of observations in order to not have NA in output of the
function of ksmooth().
What is my mistake ?
Thank you for any help.
Amir Safari
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