What is r-value
Many students asked me what exactly is r-value. They are always confused with the idea of correlation and causation. If you’re still confused, let me first establish that r-value implies [...]
Why can’t we extrapolate regression lines
Many students memorise the standard answer, that is, when the estimated data is not within range, we are extrapolating so it is not reliable. But why is it unreliable! Consider an example of [...]