This article descrbes how to easily plot smooth line using the ggplot2 R package. You will learn how to add: regression line, smooth line, polynomial and spline interpolation.
r - How to add a smooth line using ggplot2 in a plot with 2 different datasets - Stack Overflow
Be Awesome in ggplot2: A Practical Guide to be Highly Effective - R software and data visualization - Easy Guides - Wiki - STHDA
ggplot2 - How to smooth the line in R ggplot - Stack Overflow
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ggplot2 scatter plots : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA
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Visualizing Data
How to Plot a Smooth Line using GGPlot2 - Datanovia
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Drawing Survival Curves using ggplot2 • survminer
