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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