We have all read correlation matrixes, and have seen:
As a rule of thumb, the following guidelines on strength of relationship are often useful (though many experts would somewhat disagree on the choice of boundaries).
Value of r Strength of relationship 1.0 to -0.5 or 1.0 to 0.5 Strong -0.5 to -0.3 or 0.3 to 0.5 Moderate -0.3 to -0.1 or 0.1 to 0.3 Weak -0.1 to 0.1 None or very weak
But what does a correlation of 0,4 look like?
Play this game, and see how close you can guess the correlation. You will [probably] be surprised, and think twice next time you are impressed by a correlation of 0,5.
main menu the aim of the game is simple. try to guess how correlated the two variables in a scatter plot are. the closer your guess is to the true correlation, the better. your guess should be between zero and one, where zero is no correlation and one is perfect correlation.