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I am using visreg to visualize a continuous by continuous interaction. The model is

model1 = DayOfYear ~ year*latitude

where year and latitude are both continuous. By default, visreg plots cross-sections at the 10th, 50th, and 90th quantiles. It is my understanding that all of the data are used to calculate the slopes at these values. I want to know how visreg breaks up the points for visualization into the separate panels.

see image link

Here is my visreg code

visreg(model1, "year", by="decimalLatitude", breaks = 3, 
       partial = TRUE, alpha = 0.05, overlay=FALSE, 
       gg = TRUE, points = list(pch = 20, alpha = .5), xlab = "", 
       ylab = "")
Martin Gal
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Sarah Anderson Weaver
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  • Please make a [reproducible example](https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example). – Martin Gal Jul 19 '21 at 22:15

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