Мои наборы данных:
head(before2)
Sample Trial Anal SampleID NPOC_before ResultTN pH Treatment
1 B1 T1 NPOC/TN Bryan 16.250 1.6550 5.01 Recovery
2 B1 T2 NPOC/TN Bryan 15.160 1.4560 4.91 Recovery
3 B1 T3 NPOC/TN Bryan 10.630 0.9322 5.21 Recovery
4 B1 T4 NPOC/TN Bryan 8.484 0.8672 5.41 Recovery
5 B2 T1 NPOC/TN Bryan 16.560 2.5010 4.90 Recovery
6 B2 T2 NPOC/TN Bryan 11.490 1.2900 5.20 Recovery
head(after2)
Sample Trial Anal SampleID NPOC_after ResultTN pH Treatment
1 B1 T1 NPOC/TN Bryan 12.940 1.3100 5.01 Recovery
2 B1 T2 NPOC/TN Bryan 12.550 1.0750 4.91 Recovery
3 B1 T3 NPOC/TN Bryan 8.834 0.8050 5.21 Recovery
4 B1 T4 NPOC/TN Bryan 6.711 0.6105 5.41 Recovery
5 B2 T1 NPOC/TN Bryan 12.680 2.0170 4.90 Recovery
6 B2 T2 NPOC/TN Bryan 9.909 1.0250 5.20 Recovery
Пытался объединиться с:
merged_data<-merge(before2,after2)
# this returns 0 observations
merged_data<-merge(before2,after2,by.x="Sample",by.y="Sample")
# this returns 64 observations, with repeated values