How to add Fit Line (Trend Line) at subgroups in a scatter plot.

LokeshPulmo — Sun, 11 Jun 2023 11:19:03 GMT

How to insert separate Fit Line (Trend Line) for males and females in the same scatter plot.

The scatter plot should have different symbols for males and females.

Re: How to add Fit Line (Trend Line) at subgroups in a scatter plot.

txnelson — Sat, 06 Nov 2021 09:37:00 GMT

There are a few different platforms that can be used to plot trend lines for different subgroups.

Scatterplot Matrix'

Go to Graph=>Scatterplot Matrix
Specify the X and Y columns to use
Specify the Group variable to be Sex
Once the graph is open, select Fit Line from the red triangle.
To change the color and the markers, go to the data table
1. Select all of the rows for the males
2. Go to Row State column for one of the selected rows and right click and select the color to use
3. Right click again, and select the marker to use
4. Repeat the above three steps for the females

Graph Builder

Go to Graph=>Graph Builder
Drag the X column to the X Drop area
Drag the Y column to the Y Drop area
Right Click on the chart and select Smoother=>Remove
Click on the Fit Line icon
Drag the Sex column to the Overlay Drop Area
Drag the Sex column to the Color Drop area
In the legend area, right click on each of the lines and change the color and line style to match the colors of the markers

Fit Y by X

Go to Analyze=>Fit Y by X
Select the X and Y columns
In the output display, under the red triangle, select Group By and select the Sex column
Under the red triangle, select Fit Line
Change the marker and the color of the points as was done in the Scatterplot Matrix, by changing the Row State values for each of the sexes.