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並前往https://stackoverflow.com/questions/27082601/ggplot2-line-chart-gives-geom-path-each-group-consist-of-only-one-observation

ggplot2 line chart gives "geom_path: Each group consist of ...

You only have to add group = 1 into the ggplot or geom_line aes(). For line graphs, the data points must be grouped so that it knows which points to connect ...

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