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# ACMGM055

## 3.2 Modelling Linear Associations

### Identifying Explanatory and Response Variables

• It is important to correctly select the explanatory and response variables when using regression, or the relationship will be incorrect.
• The explanatory variable is the variable which is used to explain or predict the response variable.
• In a conventional x-y dataset, the x variable is the explanatory variable and y is the response variable.

### Fitting Least Squares Models

• Start by identifying the explanatory and response variables.
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## 2.1 Response and Explanatory Variables

### Explanatory Variable

• The explanatory variable (EV) is the variable used to explain or predict another variable (the response variable).
• By convention, the explanatory variable is plotted along the x-axis of a graph, if it is numerical.

### Response Variable

• The response variable (RV) is the variable which is explained or predicted by the explanatory variable.
• By convention, the response variable is plotted along the y-axis of a graph, if it is numerical.

Note: both explanatory and response variables can be either categorical or numerical variables.

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