| Margin | Variable 1 | Variable 2 |
| 100 | 10 | 20 |
| 75 | 20 | 30 |
| 50 | 30 | 40 |
| 25 | 40 | 50 |
After setting up the linear regression and also a step-wise regression on the above sample data (I have many more columns), I am noticing that the R^2 value of the targeted variable (margin) is around 20%. So, I am thinking of breaking the data into quartile (using Tile) and want to create a model to predict that my margin is in the first quartile. How would I do that?