Simple Linear Regression Plot
Contents
Introduction
A Simple linear regression plot is a scatter plot with a regression line that shows the general direction (trend) that a group of points (plots) seem to be heading. The plots show the relationship between a scalar dependent variable Y and an explanatory variable denoted X.
Inputs
To illustrate the Simple Linear Regression Plot, we will run it on a dataset within South Australia
- Select South Australia as your area
- Select SA2 Chronic Disease – Modelled Estimate as your dataset, and select the following attributes:
- Statistical Area 2 Code
- Statistical Area 2 Name
- Type 2 diabetes (synthetic prediction) – Rate per 100
- Circulatory system diseases (synthetic prediction) – Rate per 100
Open the Simple Linear Regression Plot tool (Analyse → Tools → Charts → Regression Simple Linear Plot) and enter the following parameters as shown in the image below (These are also explained in more detail below the image).
- Dataset Input: For this we want to select SA2 Chronic Disease – Modelled Estimate
- Dependent Variable: This is where we select the variable that we want to model, or regress on the independent variable. In this instance we choose Type 2 diabetes (synthetic prediction) – Rate per 100
- Independent Variable: This is where we select the variable that we want to test as the predictor for the dependent variable. In this instance we chooseCirculatory system diseases (synthetic prediction) – Rate per 100
- Use Variable Titles: Check this box to have “human readable names” on your output chart
- Chart Title: This is where we enter the name that we want to give the resultant plot. In this instance we choose Linear Regression Plot: Type 2 Diabetes vs Circulatory System Diseases
- Grid: Tick this if you want gridlines for your graph
- Legend: Tick this if you want to include a legend for your graph
- Greyscale: Tick this if you want your graph to be produced in greyscale; leave blank if you want it be produced in colour.
Once you have entered the parameters, click Add and Run
Outputs
Click on the Display button on the pop-up dialogue box that appears. Your output graph should look something like the graph below
Showing a positive relationship between the rate of Type 2 Diabetes and Circulatory System Diseases within South Australian SA2s