Something that should exist:
geom_principal_curve()
If x and y have a symmetric relationship, eg both x and y are noisy measurements of an underlying hidden variable, geom_smooth will under-estimate the slope, just like linear regression.
geom_principal_curve()
If x and y have a symmetric relationship, eg both x and y are noisy measurements of an underlying hidden variable, geom_smooth will under-estimate the slope, just like linear regression.
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