lm_ex: A linear regression teaching tool

In jvcasillas/lingStuff: Tools and Gems for Linguistics Related Research

A linear regression teaching tool

Description

This function takes user inputs, creates a data frame, fits a linear model, and plots the output. The function can take 4 optional arguments that adjust the relationship between x and y. The purpose of this function is to help teach the linear model.

Usage

lm_ex(
  n = 100,
  intercept = 50,
  slope = 10,
  sigma = 0.5,
  custAxis = FALSE,
  xlim = NULL,
  ylim = NULL,
  base_size = 20,
  text_size = 5
)

Arguments

n	Number of observations
intercept	The y-intercept
slope	The slope the line
sigma	Spread around the mean
custAxis	Logical. Set to true to use custom xlim/ylim
xlim	Vector for x axis, 'custAxis' must be TRUE.
ylim	Vector for y axis, 'custAxis' must be TRUE.
base_size	Numeric value to adjust plot text size
text_size	Numeric value to adjust annotation text size

Examples

# 'y' as a function of 'x' with 100 observations, intercept 
# of 50, slope of 10, and sigma at 0.5
lm_ex()

# Negative slope
lm_ex(n = 55, intercept = 25, slope = -5, sigma = 0.75)

jvcasillas/lingStuff documentation built on Jan. 6, 2025, 3:05 p.m.