Despite the chant that correlation is not causation, some researchers believe the design of scatter plots nudges us to the wrong conclusions. Can a change in their design lessen that risk? Analyzing ...

If you understand the definition of a mathematical function, a good way to judge it is that any line drawn parallel to the y-axis intersects with the values in the function’s curve only once. The same ...

Please read my last post first, before you begin this one. I ended the last post by suggesting that we were probably more interested in changes than in price levels. If this isn't immediately ...

Let’s look at what correlation means in terms of the relationship between variables. Although our focus will be on positive correlation, we will also describe negative correlation and what we mean ...