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.
How to Plot a Smooth Line using GGPlot2 - Datanovia
/sthda/RDoc/figure/ggplot2/ggplot2-ad
Linear Lines :: Staring at R
Becoming an AnimatoR
ggplot2 scatter plots : Quick start guide - R software and data visualization - Easy Guides - Wiki - STHDA
Becoming an AnimatoR
Ggplot2 Scatter Plots - Quick Start Guide - R Software and Data Visualization - Easy Guides - Wiki - STHDA, PDF, Machine Learning
Data visualization with ggplot2 part 2, smooth lines, R for data science book club
Chapter 3 Graphing STA 444/5 - Introductory Data Science using R