Some of these variables will represent a continuous range of behavior (for instance, from a computer novice to a computer expert), and a few will represent multiple discrete choices (for example, uses a digital camera versus uses a film camera).

• 有些变量可能会代表一个连续范围内的行为（比如从计算机新手到老手），有些变量可能会代表一些多个离散的选择（比如使用数码相机和使用胶卷相机）。