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...me with 7305 obs. and 10 variables Once I apply this code I only receive a data frame with 58440 obs. of 2 variables, of which there should be 73,050 obs. of 2 variables, just wondering what is happening here? View(nfcuy_bw) attach(nfcuy_bw) cuyahoga_nf<-data.frame(s5,s10,s25,s27,s33,s41,s51,his_c) cuy_nf<-stack(cuyahoga_nf) Thanks Meredith -- Doctoral Candidate Department of Civil and Environmental Engineering Michigan Technological University [[alternative HTML version deleted]]