Mathisfun.com bills this as a Least Squared Error calculator, but I don't think it is a calculator. I think it is a nice visual aid that demonstrates how the regression line/equation change as your data changes.
The static photo below doesn't do this interactive website justice. You can drag and drop any of the dots on the scatter plot and watch as the regression line and regression line equation are recalculated to best predict Y based on X.
It doesn't explicitly show the math going on behind the scenes, but it is a nice compliment to your LSE lecture.
https://www.mathsisfun.com/data/least-squares-calculator.html
The static photo below doesn't do this interactive website justice. You can drag and drop any of the dots on the scatter plot and watch as the regression line and regression line equation are recalculated to best predict Y based on X.
https://www.mathsisfun.com/data/least-squares-calculator.html
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