![ggplot2 line plot : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA ggplot2 line plot : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA](http://www.sthda.com/sthda/RDoc/figure/ggplot2/ggplot2-line-plot-logo-data-visualization-1.png)
ggplot2 line plot : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA
![ggplot2 line plot : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA ggplot2 line plot : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA](http://www.sthda.com/sthda/RDoc/figure/ggplot2/ggplot2-line-plot-legend-position-data-visualization-1.png)
ggplot2 line plot : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA
![Adding an alpha to geom_line causes the line colours to not appear in legend. Adding theme options causes the lines to not appear in the plot (only in RStudio Plots pane) · Adding an alpha to geom_line causes the line colours to not appear in legend. Adding theme options causes the lines to not appear in the plot (only in RStudio Plots pane) ·](https://user-images.githubusercontent.com/952340/36180545-ec646b50-10ee-11e8-9f30-fbb5dd2b3394.png)
Adding an alpha to geom_line causes the line colours to not appear in legend. Adding theme options causes the lines to not appear in the plot (only in RStudio Plots pane) ·
![ggplot - how to show individual observations with geom_line but group their color? - tidyverse - RStudio Community ggplot - how to show individual observations with geom_line but group their color? - tidyverse - RStudio Community](https://community.rstudio.com/uploads/default/original/3X/2/a/2a4ddb45562ee39789d7c4919571e9abccc8ddc3.png)