method_plot_internal: Internal Functions for Plot Method
In JENScoding/York: York's regression of X and Y-variables with correlated errors

Functions used in plot.york method. For functions in "Internal Functions for Plot Method" the output is used for proceeding calculations or displaying in the plot.york method. All the functions in "Internal Functions for Plot Method" begin with f_p_ and then the name of the function is given.

f_p_influential determines influential points in a york regression. An influential point is defined as a point that significantly changes the slope coefficient if omitted. Assymptotic normality of the slope coefficient is assumed. The test is based on a significance level of alpha = 0.01.

f_p_chisq_test is a function that calculates the critical values for alpha = c(0.1, 0.05, 0.01) and the corresponding probabilities in a χ^2–test. Additionally, values for the rejection region for alpha = 0.01 are given.

f_p_influential(x_data, y_data, mult_samples, sd_x, sd_y, r_xy_errors,
  coef, coef_se, tolerance, max_iterations, x_mult, y_mult)

f_p_chisq_test(chisq_df, p_value, chisq_statistic)