Скачать или смотреть Variable Relationships

We identify a relationship among variables when we notice that changes in one variable correspond to changes in another variable. There are multiple reasons why this can happen. One variable might be influencing a second variable. A third behind-the-scenes variable might be influencing both of our observed variables. All variable relationships are important to understand, but not all relationships are the same. We should begin the study of relationship by defining relationship and identifying reasons for relationship. With this understanding, we can move on to learning how to picture and describe variable relationships.