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...",..: 6 6 6 6 5 5 5 6 5 5 ... The only NAs are in the factor dg (put in by 'recode' from the car library; I'm trying to eliminate cases with particular factor levels) > table ( ex10s$dg ) 0 1 2 3 4 5 NA 2851 271501 63112 98425 335593 1257299 160795 So, I remove the rows with NAs, to a new dataframe ex10ss: > ex10ss<-na.omit(ex10s) Check all the NAs have been removed: > table(ex10ss$dg) 0 1 2 3 4 5 NA 2851 271501 63112 98425 335593 1257299 160795 > dim(ex10s)...

Dear friends, I met a problem on plotting. My dataset is : year MHBC LHBC MHRC LURC 1993 11.75 4.50 0.43 0.46 1994 7.25 1.25 0.35 0.51 1995 8.67 2.17 0.54 0.44 1996 2.67 1.33 0.78 0.47 1997 3.42 4.92 0.69 0.48 1998 1.92 3.08 0.72 0.54 1999 2.33 2.58 0.74 0.41 2000 5.75 4.50 0.45 0.50 2001 3.75 4.42 0.52 0.47 2002 2.33