People often transform their variables. There are two sorts of transformation: One is to simply multiply all the values by a constant. This does not affect the relationships among the variables and, properly done, it will make the output easier for humans to interpret. We measure human height in centimeters (or maybe meters), not kilometers, but the results are the same. In my view, people often fail to do this type of transformation when they ought to: e.g. they will leave “income” in dollars when thousands of dollars makes more sense.
The other sort of transformation is when we take logs or square roots or some other power of the variable. This does affect the relationships among variable and, in my view, people do it too much.
This sort of transformation should be done for substantive reasons, not statistical ones. Read more!