Figure 1.17: Figure 1.11 Choosing Level of Measurement To choose the level of measure, think of two cases with different scores. Then ask these four questions: (1) Do the scores tell whether the two cases are the same or different? (2) Do the scores reveal the direction of the difference between the two cases? (3) Do the scores tell the size of the difference between the two cases? (4) Is there an absolute zero point on the scale?