 
  
  
  
     Dear R users,
  Before running ksmooth( ), a suitable bandwidth selection is needed. I  use some functions  for doing this task and receive these results  for my data:
  
   bw<-width.SJ(y, nb=100,method="ste") : 26.38
   bw<-bcv(y,nb=100) : 40.53
   bw<-ucv(y)   : 41.25
   bw<-bandwidth.nrd(y) : 45.43
   After implementing the function   ksmooth(x,y, bandwidth=bw)  , I have some NAs in output for all bandwidth selection functions. But  if the bandwidth be equal to 62 or more, the function   ksmooth(x,y) 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 ordet to not have  NA in output. 
  What are reasons and my mistake ?
  Thank you for any reply.
  Amir Safari
  
  
  
  
  
  
  
  

		
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