When the applet is first opened, the initial dataset consists of the most recent 1,500 feelings collected by our system. The applet's panel can then be used to arbitrarily specify different populations, constrained by any combination of:

- Feeling (happy, sad, depressed, etc.)

- Age (in ten year increments - 20s, 30s, etc.)

- Gender (male or female)

- Weather (sunny, cloudy, rainy, or snowy)

- Location (country, state, and/or city)

- Date (year, month, and/or day)