1. Data Frame and Hubble's Plot

2. We can combine vectors into a spreadsheet-like format that R calls a data.frame (copy and paste)
dist = c(0.032,0.034,0.214,0.263,0.275,0.275,0.45,0.5,0.5,
0.63,0.8,0.9, 0.9,0.9,0.9,1,1.1,1.1,1.4,1.7,2,2,2,2)
vel = c(170, 290, -130, -70,-185,-220, 200, 290, 270, 200,
300, -30, 650, 150, 500, 920, 450, 500, 500, 960, 500,
850, 800, 1090)
hubble = data.frame(dist, vel)

3. Result

4. Plot the Hubble Data

5. Result of plotting Hubble Data

6. Note we can export the plot

7. Fitting the Hubble data.frame to a linear model

8. Summary of linear model from R and the linear fit from Excel for comparison
The intercept and slope are the “coefficients”.

9. Using abline() to add linear model result to plot

10. Get help on a function

11. Adding the equation to the plot
Text(middle_x, middle_y, text_to_display)
Note that 0.5 is near the middle of the displayed equation horizontally
And that 800 is near the middle of the displayed equation vertically