Area spline graphs are similar to area graphs and spline graphs. They are useful for showing the relationship between two numeric variables.

## When To Use an Area Spline Graph

Area spline graphs are useful when you want to show the relationship between two numeric variables that have a smooth relationship, and you need a solid fill under the line. The solid fill can be useful for presentations, where some viewers may be a long way from your slide and might not be able to see a single line on a line graph.

Regression analysis can instead be used to quantify the relationship between two numeric variables.

## How To Make an Area Spline Graph

### Upload your data

Use the upload section at the top of the page to upload your data.

### Select the column for the horizontal x-axis

Choose the independant variable for the x axis. The independant variable should not change because of the independant variable.

### Select the column for the vertical y-axis

Choose the dependant variable for the vertical y-axis. The dependant variable should be influenced by the value of the independant x-axis

### Download your area spline graph

Use the download button on the top rigtht of the graph to download a png file