get_marginal: Get marginal
In pmcharrison/hvr: Harmonic Viewpoint Regression

Get the marginal effect of a continuous viewpoint.

get_marginal(x, viewpoint)

## S3 method for class 'viewpoint_regression'
get_marginal(x, viewpoint)

`x`	Object from which to extract the marginal effect.
`viewpoint`	Character string identifying the viewpoint whose marginal effect should be extracted.

A tibble with the following columns:

feature_rel - Relative feature value, where 0 is the minimum theoretically possible feature value found when computing the model matrix (i.e. looking over the full alphabet of possible chord continuations), and 1 is the maximum such value.
feature_raw - Absolute feature value.
feature_obs - TRUE if the feature value falls within the range of actually observed feature values in the model matrix.
effect - The resulting effect, i.e the resulting contribution to the model's linear predictor.