This interactive dashboard helps you to understand univariate linear regression. You have some observations – represented by their x and y coordinates in the first plot, colored in blue. They are defined by a slope, an offset, and some noise.
If you modify the parameters, you see the impact.
You also see a model result, described by an estimated slope and an estimated offset. The second plot on the right side shows the error metric (RMSE). You will find out, that the minimum error is found, if the estimated slope and offset equals the true slope and offset. Please modify the parameters to see yourself.