Whenever you first pull or clone an app from a repository, you need to run this command to install all the Node packages:
meteor npm install
Run the app on your local machine with one command:
This can take a few minutes.
This will start the app that you can access as a participant: https:/localhost:3000/
You can access the
admin panel here: https:/localhost:3000/admin
Log in with the username and password provided in the command line.
Treatments and factors can also be entered manually via the admin panel.
Empirica also enables "experiment as code" by which experimental treatments and factors can stored in a
.yaml file (e.g.,
To load factors and treatments from a
.yaml file , go in the admin panel and:
click on the Configuration button
click on import
.yaml file you want to import the factors and treatments from
wait a few seconds for the factors and treatments to be imported
To run a game, create a new
batch with the games of treatments you want to use and click start on the batch.
Open a player tab by going to https:/localhost:3000/ or clicking on open app.
The player that you open with https:/localhost:3000/ is cached on your browser. Whenever you start a game with this player, your local app will keep that information. To play again there are multiple things you can do:
Click on the Reset current session button in the top right to reset this player, and create a new game for this player to join.
Click on the New Player button in the top right to open a new tab with a different player (you will see tab with an id).
Go to the Players tab in the admin panel and retire players that have finished or cancelled.
The app will automatically ("hot") reload when save changes to the code.