| ShallowReg {tigerstats} | R Documentation |
Regression Line Too Shallow?
Description
The regression line is not as steep as the SD Line (line through point of averages, with slope = sd(y)/sd(x)). The difference is especially noticeable when the scatter plot is the result of a sample from a bivariate normal distribution. This app explains why we use the regression line to predict y from x, even though the SD line appears to be a better linear summary of the scatter plot. Can be used as a starting-point for a discussion of "regression to the mean."
Usage
ShallowReg(n=900,rho=0.5)
Arguments
n |
Number of points in the scatter plot. |
rho |
Target correlation for the scatter plot. Points are selected from a standardized bivariate normal distribution, with correlation rho. |
Value
Graphical output.
Note
Uses manipulate, available only in R Studio, and mvrnorm from package MASS.
Author(s)
Homer White hwhite0@georgetowncollege.edu
Examples
## Not run:
if (require(manipulate)) ShallowReg()
## End(Not run)