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My last blog post described three ways to add a smoothing spline to a scatter plot in SAS. I ended the post with a cautionary note: From a statistical point of view, the smoothing spline is less than ideal because the smoothing parameter must be chosen manually by the user.
Prevent chart with Smooth Lines from not going less than a minimum value - Microsoft Q&A
plot - How to fit a smooth curve to my data in R? - Stack Overflow
SAS Help Center: Scatter Plot Smoothing
How to shade the area under a normal curve in an Excel chart?
Solved: gplot and sgplot - SAS Support Communities
How to automatically select a smooth curve for a scatter plot in SAS - The DO Loop
Create Scatter Plot with smooth Line using Python - GeeksforGeeks
How to Create a Scatter Plot with Lines in Google Sheets - Statology
How to smooth the angles of line chart in Excel?