How to Create a Streamgraph

This article describes how to go from crosstabbed data containing at least one numeric or date variable for the rows:

To a state where you have a type of stacked area chart called a streamgraph where it is modified so that the streams are centered around the y-axis:

Requirements

You will need to have one of the following:

A crosstabbed table that has a numeric or date variable set as the rows
Variables, including at least one numeric or date variable, that are suitable for crosstabbing, or
Crosstabbed input data that is stored in a spreadsheet document with a numeric or date variable set as the rows

With the table selected, from the object inspector, go to OUTPUT > Visualization > Time Series > Stream.

Alternatively, you can use 2 other data source methods:

From the toolbar, go to Visualization > Time Series > Stream. Click onto the page to place the visualization, and then...

From Variables in 'Data' in the object inspector, select your date or numeric variable from the Data Sets tree which will be used for the x-axis. Under Groups select your second variable which will be used as y coordinates of the series on the streamgraph.
From the object inspector, click Paste or Type data. Directly enter or paste data into the spreadsheet object into Displayr. This input should be in a similar form as the first option, with date or numeric row names in the far left column.