polynomial_regression_plot: Polynomial Regression Plot

In psycModel: Integrated Toolkit for Psychological Analysis and Modeling in R

Polynomial Regression Plot

Description

The function create a simple regression plot (no interaction). Can be used to visualize polynomial regression.

Usage

polynomial_regression_plot(
  model,
  model_data = NULL,
  predictor,
  graph_label_name = NULL,
  x_lim = NULL,
  y_lim = NULL,
  plot_color = FALSE
)

Arguments

model	object from lm
model_data	optional dataframe (in case data cannot be retrieved from the model)
predictor	predictor variable name (must be character)
graph_label_name	vector of length 3 or function. Vector should be passed in the form of c(response_var, predict_var1, predict_var2). Function should be passed as a switch function that return the label based on the name passed (e.g., a switch function)
x_lim	the plot's upper and lower limit for the x-axis. Length of 2. Example: c(lower_limit, upper_limit)
y_lim	the plot's upper and lower limit for the y-axis. Length of 2. Example: c(lower_limit, upper_limit)
plot_color	default if FALSE. Set to TRUE if you want to plot in color

Details

It appears that predict cannot handle categorical factors. All variables are converted to numeric before plotting.

Value

an object of class ggplot

Examples

fit = lm(data = iris, Sepal.Length ~ poly(Petal.Length,2))
polynomial_regression_plot(model = fit,predictor = 'Petal.Length')

psycModel documentation built on Nov. 2, 2023, 6:02 p.m.