EV and RV

[StaticZ1011]

hello guys, i need help with the differences between EV and RV, i keep getting them mixed around and if its ok to leave a example to make it easier

[Aaron]

hello guys, i need help with the differences between EV and RV, i keep getting them mixed around and if its ok to leave a example to make it easier

The EV is the explanatory variable and it's primary purpose is to explain or justify a change in the response variable.

Consider two variables: location and house price.

Which one of these two variables would explain the other? Well, depending on the location the house price is going to differ.. so the explanatory variable is location because the location explains the house price. The location influences the price not the other way around

A house price is definitely going to be higher if you buy in Metro Melbourne as opposed to regional or rural Victoria. Same goes for if you wanted to buy for example in Toorak as opposed to Broadmeadows (first two I could think of soz)

It's important to recognise that these relationships don't have to be exactly linear and in alot of cases textbooks deliberately make these relationships difficult to identify.

Remember EV always goes on the X axis of your scatterplot.

P.S - You are definitely not the only one who gets confused with this!

[Awal01]

EV (Explanatory variable) is also known as the independent variable. This is the variable that is on the x-axis and dictates what happens to the y values. The EV tells what the RV (Response variable) to do basically. For example in an gradient-intercept equation: y=mx+c, in this equation we put in an x-value to find out the y-value, this value is the response.
A simple real life example could be: the amount of force you put into your punch if you hit someone and the level of pain that person feels. The EV in this scenario should be the amount of force you put into the punch and the RV should be the level of pain the other person feels. The harder you punch him the more pain he feels. So the EV dictates the response (RV). Hope this helps.