Ggplot is the most popular plotting extension to R and replicates many of the graph types found in the core plotting libraries. This course provides an introduction to the ggplot2 libraries and gives a practical guide for how to use these to create different types of graphs.
Correlation does not capture relationships that are not linear: If the relationship is not linear, then correlation will not be meaningful. Check out the plot below. Check out the plot below. There is a clear U-shaped relationship between the two variables, but the correlation coefficient for these data is very close to 0.

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Here, hp is a continous variable, so ggplot2 uses the darkness of the color to indicate the value. However, if we use a categorical varibable or a factor (e.g. binomial variable), ggplot2 will use different colors to show different types.
Correlation does not capture relationships that are not linear: If the relationship is not linear, then correlation will not be meaningful. Check out the plot below. Check out the plot below. There is a clear U-shaped relationship between the two variables, but the correlation coefficient for these data is very close to 0.

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Plotting PCA results in R using FactoMineR and ggplot2 Timothy E. Moore. This is a tutorial on how to run a PCA using FactoMineR, and visualize the result using ggplot2.
However, ggplot2 treats integers and doubles as continuous variables, and treats only factors, characters, and logicals as discrete. For example, in the tibble x , count is an integer variable (the L s create integers).

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Add correlation coefficients with p-values to a scatter plot. Can be also used to add `R2`. stat_cor ( mapping = NULL ... If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot(). A data.frame, or other object, will override the plot data. All objects will be fortified to produce a data frame.
Add correlation and p-value to a ggplot2 plot geom_cor.Rd geom_cor will add the correlatin, method and p-value to the plot automatically guessing the position if nothing else specidfied. family font, size and colour can be used to change the format.

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The Hall-Yarborough correlation. Kenneth Hall and Lyman Yarborough used the hard-sphere equation as the basis for the equation of state. They tested the correlation with 12 reservoir gas reservoir systems up to Ppr as high as 20.5. The Standing-Katz chart only extends to Ppr=15. At that moment the Standing-Katz chart had 30 years of existance.

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