"An independent variable is like a knob you can turn - it's an adjustable thing. A dependent variable is what changes when you turn the knob. You can change the hours of study, and as a result the course grade changes. That makes the hours of study the independent variable and the course grade the dependent variable."
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.