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...: 4.494652 For the results,we can see that the EDF is much less than K-1,so according to "If the effective degrees of freedom for a model term are estimated to be much less than k-1 then this is unlikely to be very worthwhile",I think the results are reasonable. Why? Thanks in advance wanhai -- View this message in context: http://r.789695.n4.nabble.com/check-k-function-in-mgcv-packages-tp4634050.html Sent from the R help mailing list archive at Nabble.com.